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73-87 Chevy _ GMC Trucks => Fuel Systems and Drivability => Topic started by: philo_beddoe on November 20, 2015, 10:06:47 pm

Title: Filler neck trouble!
Post by: philo_beddoe on November 20, 2015, 10:06:47 pm: I thought i posted a long time ago but could not find. Anyway, any common reason why i cannot squeeze the gas pump lever all the way, i have to squeeze very slightly or the gas will back up and out all over truck and ground. Could there be a blockage, is it the vent line? Plus they are hard to find, if ya know where i can one, let me know, thanks.
Title: Re: Filler neck trouble!
Post by: Usareke on November 21, 2015, 12:13:15 am: Well mine does that, I just pull the nozzle out a bit to where it just kinda rests on the bend and pump it there, works for me anyway, but it does tend to puke fuel out when the pump shuts off fast so I just put some paper towels under the nozzle or listen for that almost full sound and go at it by hand! Best of luck to ya!

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Title: Re: Filler neck trouble!
Post by: Irish_Alley on November 21, 2015, 07:12:57 am: ive always had problems with these new pumps. i did find a couple of the old school ones that dont have the pollution crap on them that seam to work better or i would just do what usareke said.
Title: Filler neck trouble!
Post by: philo_beddoe on November 21, 2015, 07:56:32 am: Yup, thats exactly what it does. When the fuel backs up and trips the shut-off, it pukes it out. There MUST be a reason for this, or else ALL the squarebodies would have this problem. Why did the engineers put that filler spot so low, need gravity!!!
Title: Re: Filler neck trouble!
Post by: Usareke on November 21, 2015, 08:03:30 am: Yeah I've always had this issue, that's the only way I've found to combat it. If you find something else please share with the rest of us! Lol

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Title: Re: Filler neck trouble!
Post by: Irish_Alley on November 21, 2015, 08:09:31 am: i dont think it was a problem when our trucks were being built. but it has became a problem once the epa changed how the fuel nozzles at gas station are designed for less fuel vapor escaping.
Title: Re: Filler neck trouble!
Post by: enaberif on November 21, 2015, 10:00:16 am: Flip the fill nozzle upside down as it will sit better and flow better into the tank no more trip offs.

Everyone who drives a squarebody generally knows this.
Title: Re: Filler neck trouble!
Post by: zieg85 on November 21, 2015, 10:22:25 am: Quote from: philobeddoe on November 21, 2015, 07:56:32 am
Yup, thats exactly what it does. When the fuel backs up and trips the shut-off, it pukes it out. There MUST be a reason for this, or else ALL the squarebodies would have this problem. Why did the engineers put that filler spot so low, need gravity!!!

That was an issue back then. That is one reason why they went to the gas doors in 1979. They got the filler tube higher and at a better angle.
Title: Re: Filler neck trouble!
Post by: SMURff on November 21, 2015, 11:43:37 am: I put it side ways it works well but you can't go really fast I've tried everything else but gas just spills out also I've been wanting to relocate the fillers to the top of the bed rail what are your opinions on that.?
Title: Re: Filler neck trouble!
Post by: Usareke on November 21, 2015, 11:51:58 am: I have a 79 and it still has this issue so I'm not sure fixed it until late 80's
Quote from: zieg85 on November 21, 2015, 10:22:25 am
Quote from: philobeddoe on November 21, 2015, 07:56:32 am
Yup, thats exactly what it does. When the fuel backs up and trips the shut-off, it pukes it out. There MUST be a reason for this, or else ALL the squarebodies would have this problem. Why did the engineers put that filler spot so low, need gravity!!!

That was an issue back then. That is one reason why they went to the gas doors in 1979. They got the filler tube higher and at a better angle.

Sent from my SAMSUNG-SGH-I317 using Tapatalk
Title: Filler neck trouble!
Post by: philo_beddoe on November 21, 2015, 06:06:02 pm: So in summary, the reason it backs up is because its just too low? I was about to buy a new filler neck. There must be a fix for this, like three cars pull up and leave while im still sitting there.
Title: Re: Filler neck trouble!
Post by: frotosride on November 21, 2015, 06:19:24 pm: I really don't have thisproblem with my 16 gallon tank except random brand new gas stations. I typically just position it to where I know the fuel is aimed directly at the elbow in the fill line. With the 20 gallon tank I have to position it just right every time because the filler neck is so short. The guy at the plaza on the Jersey Turnpike was really getting frustrated with it because he couldn't just start it and walk away
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 21, 2015, 06:25:16 pm: Yeah, even worse, MA just started using the little tab that locks the lever down so you dont have to hold the lever. I cant even put it on the first click!
Title: Re: Filler neck trouble!
Post by: GregL on November 24, 2015, 09:43:40 pm: This has been a complaint since this body style was introduced in 1973. I was working at a gas station pumping gas and everyone was howling about how they couldn't fill their trucks except at a trickle. The problem with the earlier trucks was that the filler neck angle was just too sharp at the top. Gas nozzles wouldn't even fit all the way in. This is more of a problem here in California with the stupid rubber cone on the pump nozzles. If they aren't compressed, no gas. So, like said earlier, either turn the nozzle upside down or shove a funnel in the neck and hold the rubber cone up with your hand. I have this same problem with my 1968 Firebird when I fuel up.
Title: Re: Filler neck trouble!
Post by: LTZ C20 on November 24, 2015, 09:49:15 pm: Ya know, I never knew people had this issue. I'm in Cali too, I usually just put the nozzle in the hole and set the handle at medium pump speed, it works fine, both tanks, driver & passenger. I've used full speed and trickle speed also and never had an issue. I just stand there and watch the bill go thru the roof. My fill ups are always hands free.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 24, 2015, 10:54:48 pm: Huh, thats weird, send a simple pic of side of truck. I may try to modify.
Title: Re: Filler neck trouble!
Post by: LTZ C20 on November 25, 2015, 08:00:56 am: Quote from: philobeddoe on November 24, 2015, 10:54:48 pm
Huh, thats weird, send a simple pic of side of truck. I may try to modify.
You mean like literally a picture of the side of the truck? Not exactly sure what a simple picture is? Did you mean sample maybe? Or did you want a pic of the fuel filler tube?
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 25, 2015, 04:52:57 pm: The location of the filler tube, i'm trying to figure out why yours works so well and everybody else has problems with gas backing up. Its not so mucha problem, but it runs down the side and starts ruin the paint.
Title: Re: Filler neck trouble!
Post by: LTZ C20 on November 25, 2015, 11:30:18 pm: Ok, I'll take a picture soon as I can. The only time I have had an issue with it spilling down the side is when I accidently over filled it.
Title: Re: Filler neck trouble!
Post by: Jason S on November 26, 2015, 12:33:33 am: Knowing that when I had the round hole bed, there was trouble with certain fuel pumps in Texas and most of the fueling issues were in the smog sensitive areas... Below is a thread that may be of interest.

http://forum.73-87chevytrucks.com/smforum/index.php?topic=30092.msg252597#msg252597 (http://forum.73-87chevytrucks.com/smforum/index.php?topic=30092.msg252597#msg252597)
Title: Re: Filler neck trouble!
Post by: Blazin on November 26, 2015, 11:56:05 am: Every square I have ever owned has this problem, & I have had a lot of them. I found the lever upside down is the best remedy.
Also when ever I have to remove a tank, or fill pipe in one of mine, I replace it with the filler neck from a diesel, no flapper doodle thingamajig! Plus if you ever need to fill with a gas can its way easier!
Title: Re: Filler neck trouble!
Post by: LTZ C20 on November 27, 2015, 01:12:11 pm: As promised, pics.
Right
(http://images.tapatalk-cdn.com/15/11/27/ad9f8a58351180cb708ae32f9ebcd5a9.jpg)

(http://images.tapatalk-cdn.com/15/11/27/fa47cae1ad7b560336c353c714d8096e.jpg)

Left
(http://images.tapatalk-cdn.com/15/11/27/e4646464f5ef92c9e06bb08dd2fc1063.jpg)

(http://images.tapatalk-cdn.com/15/11/27/f6a7c6950e563bdb4c5dee8c7ec5edba.jpg)

They are the same, just opposites of each other.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 27, 2015, 05:05:51 pm: Thanks, i just got back from thanksgiving, will compare to mine asap andlet you know if different.
Title: Re: Filler neck trouble!
Post by: Dr_Snooz on November 28, 2015, 08:12:27 pm: Quote from: GregL on November 24, 2015, 09:43:40 pm
The problem with the earlier trucks was that the filler neck angle was just too sharp at the top.

This. The hose connecting the tank to the filler door assembly makes a very sharp, 90 deg. turn before dumping into the tank. It creates a lot of turbulence and blowback when filling. You might have better luck with a flexible hose instead of the formed rubber one that comes stock. Not sure if flex hose is available for this application though.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 28, 2015, 09:50:01 pm: At least it's an idea! I'm looking into it.
Title: Filler neck trouble!
Post by: philo_beddoe on November 28, 2015, 09:56:20 pm: Quote from: GregL on November 24, 2015, 09:43:40 pm
This has been a complaint since this body style was introduced in 1973. I was working at a gas station pumping gas and everyone was howling about how they couldn't fill their trucks except at a trickle. The problem with the earlier trucks was that the filler neck angle was just too sharp at the top. Gas nozzles wouldn't even fit all the way in. This is more of a problem here in California with the stupid rubber cone on the pump nozzles. If they aren't compressed, no gas. So, like said earlier, either turn the nozzle upside down or shove a funnel in the neck and hold the rubber cone up with your hand. I have this same problem with my 1968 Firebird when I fuel up.
Wait, so why wasnt there a recall on this back in the day?
Title: Re: Filler neck trouble!
Post by: chevybones87 on November 29, 2015, 08:23:10 pm: Even upside down pukes.. I believe its BC the pumps are so much faster now maybe...
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 29, 2015, 08:26:12 pm: I havnt tried upside down yet, but will next fillip
Title: Re: Filler neck trouble!
Post by: Irish_Alley on November 30, 2015, 12:45:31 am: i drilled out my gas filler neck to accommodate for the diesel pumps bigger nozzle. ow granted they dont have all the epa BS that the gas nozzles have, but i fill up at a truck stop and it pumps the fuel out pretty fast and i dont have a problem with it. if i can remember right when it was still the gas motor i did have problems with it
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 30, 2015, 09:08:16 am: I may try a flex and eliminate the elbow.
Title: Re: Filler neck trouble!
Post by: 76LongBox on November 30, 2015, 03:24:15 pm: This is a problem on my '76 too. I typically just run it a little slower than "full bore" and listen for it to be full to keep it from spilling out.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on November 30, 2015, 07:14:50 pm: Yup, thats what i have to do.
Title: Re: Filler neck trouble!
Post by: LTZ C20 on November 30, 2015, 10:14:35 pm: Ok. With this in mind, I got gas earlier tonight, I got a total of 15 gallons but the first 10 or so I did on full blast with no issue. I just stuck it in there and let it rip.
Title: Re: Filler neck trouble!
Post by: AZ87V10 on November 30, 2015, 10:37:26 pm: I usually don't seem to have a problem with gassing up my truck. Sometimes if I stick the nozzle all the way in it will pump for a few seconds and click off. I've just learned to pull the nozzle out partway and lock it on slow speed setting and I don't have any issues filling up or have it spray out or anything. Now granted in my part of the state I don't have to deal with emissions testing or anything so we don't have the stupid rubber boots on the fuel nozzles. They have them in the Phoenix and Tucson metro areas though.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 01, 2015, 08:35:27 am: We have no emmisions, no rubber boots, nothing. Still have a problem. I have a feeling if i replace both hoses (fill and vent) that will do the trick. Will use a flex for the main fill hose. Is this hose the same as rad hose?
Title: Re: Filler neck trouble!
Post by: Irish_Alley on December 01, 2015, 09:36:39 am: rad hose can work but its not rated for fuel
Title: Re: Filler neck trouble!
Post by: Irish_Alley on December 01, 2015, 09:41:31 am: but im kind of curious if this will work just due to the fact you still will have and 90° then slope downward. Blaz when you replace the filler neck does this fix the problem?
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 01, 2015, 11:16:43 am: I will start looking for flex fuel hose, prob 2 in.
Title: Re: Filler neck trouble!
Post by: 76LongBox on December 01, 2015, 12:59:22 pm: I used a radiator hose once. I had a hard time with the guys at O'Reilly trying to find one that had the right diameter and the right bend in it, but did eventually find one that I made work. However, not being rated for fuel, it didn't take long before I had to replace again. I found the replacement hoses at the site that shall not be named in this forum, and so far, so good.
Title: Re: Filler neck trouble!
Post by: ehjorten on December 01, 2015, 02:56:30 pm: i replaced both fuel tanks, senders, fill necks and hoses on my '77, not for filling issues, but for 35+ years of corrosion and it didn't make a difference on the filling pain at the pump!

It is the year of the vehicle that makes a difference in these 3rd gen. trucks. Pre '73-'78 has the small-neck fill (1-3/8") with just the cap on the side of the bed; like my '77! These suck to fill! Then like '79-'83 or whatever they had a fuel door and a slightly larger fill neck (1-5/8"). I assume these are easier to fill. '84-'87('91) had another version with the fuel door (I think these are 1-3/4"). I obviously have this in my '91 Crew. This is easy to fill at just about any fuel pump, but there are some stations that have weird nozzle lengths and shapes that don't like it and it will click off on occassion.

Now...don't take this as the gospel! I am sure there are exceptions and I could have got the neck sizes wrong. I even think there is a fill hose that is 1-5/8" on one end and 1-3/8" on the other. The point is that GM did move towards bigger diameter fill necks.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 01, 2015, 03:39:57 pm: I'm taking my 77 back to the dealer! Glad i got the extended warranty! Lol
Title: Re: Filler neck trouble!
Post by: werewolfx13 on December 01, 2015, 11:28:47 pm: You can buy somewhat flexible lengths of fuel filler hose at parts stores, but its EXPENSIVE, and not real flexible....works well for flatbeds and the like, not so hot for having to make short sharp bends...has to be cut with a chop saw or hacksaw, as its steel wire reinforced....Tends to run $20-$35/foot, depending on diameter.
Title: Filler neck trouble!
Post by: philo_beddoe on December 02, 2015, 07:00:51 am: Wow! Forget that stuff. Plus these filler necks are very low!!! I have to squat down or reach way down and that gets crampy after 10 min. Need more gravity!
Title: Re: Filler neck trouble!
Post by: LTZ C20 on December 02, 2015, 09:50:06 am: The level at which people find this issue disturbing is making me laugh. I never have issues and it seems that lots of you guys are always struggling with this, I'm not laughing at you guys of course, it's comical how much this happens and apperently for the amount of time I've owned my truck, I've been locked in the box of easy fuel filling, now you guys slid the key under the door and now the doors open but I'm still in here lol I feel bad for you guys that fight this I really do.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 02, 2015, 08:23:01 pm: I tried the upside down pump, much worse! Somehow, the gas spilled all behind the bed body! Weird. Holding the gas nozzle normal filled fine, but of course at a trickle. Whats your secret LTZ?!!!!
Title: Re: Filler neck trouble!
Post by: LTZ C20 on December 02, 2015, 10:03:29 pm: Honestly I don't know! Just lucky I guess.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 03, 2015, 12:23:11 pm: Regardless, i'm not giving up!! Sick of spilled gas and no way will i tolerate it with new paint.

I'll just wait for Chevy to send out a recall notice.
Title: Re: Filler neck trouble!
Post by: TerryY on December 03, 2015, 11:07:08 pm: Is the vent hose clear or full of spider webs and junk?
Title: Re: Filler neck trouble!
Post by: LTZ C20 on December 04, 2015, 01:00:58 am: Quote from: TerryY on December 03, 2015, 11:07:08 pm
Is the vent hose clear or full of spider webs and junk?
To whom are you asking?
Title: Re: Filler neck trouble!
Post by: Gagecampbell82 on December 04, 2015, 01:43:06 am: I have this problem at certain stations. But in north Alabama we have no emissions testing and A LOT of small "mom and pop" style gas stations. I like to give my money to the locally owned business but some of them will not fill my truck, I literally have to do as if the tank is full and put a few cents at a time, but I've chalked it up to the shape of the nozzles.

It's not really annoying usually. But the people behind me hate it.haha. And my truck is pretty low so I basically bend in half to fill it. But I've heard these trucks are notorious for it. And at the end of the day I'm fine with it, I May replace the fill and vent hoses when the float stops working just to see.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 04, 2015, 07:33:14 am: ya know, good point, I'll check that vent hose today.
Title: Re: Filler neck trouble!
Post by: frotosride on December 21, 2015, 07:27:24 pm: Ok so I think I figured out the issue. I'm not exactly sure how the pump itself works but I know that when it gets submerged it shuts off. When the pump is at full flow the vent (at the tank) acts like a Jet Pump and picks up fuel from the gas filling the tank and if the newer pump is as sensitive as most are it will stop the flow... not sure of an easy fix as of now but I will add it to the to do list.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 22, 2015, 05:49:30 pm: Not sure about that mr. froto, but you could be on to something. Keep me posted!!
Title: Re: Filler neck trouble!
Post by: Greybeard on December 23, 2015, 02:57:46 pm: I agree with the idea of finding the sweet spot pertaining to the angle of the filler neck and pointing the nozzle in that direction.

Isn't the clear tubing fuel rated? It's used on motorcycles all the time. It comes in large diameters at most hardware stores. Nevertheless, I don't think the issue is with the rubber tube, its the metal neck itself. I cut the siphon restriction (actually the low-lead nozzle restriction) out of mine and that helped IIRC. It allows the nozzle to swing that extra fraction of an inch to line up with the bend better. But I've only seen one pump with emissions equipment on it (and that station didn't survive long), it's good to live in a state that does not require worthless ideas to be put into action.
Title: Re: Filler neck trouble!
Post by: philo_beddoe on December 23, 2015, 04:42:27 pm: I have been finding that aiming the pump to the left side, pointing toward the rear of truck, helps. And that hsppens to be away from the vent line.
Title: Filler neck trouble!
Post by: philo_beddoe on May 12, 2017, 09:21:21 pm: Update:

During my body resto, i installed a new filler neck and hoses. Now the gas fills at full speed. Good fit. I noticed the opening is much larger than the oem, and the vent hose is larger as well.
Title: Re: Filler neck trouble!
Post by: JohnnieB on July 25, 2017, 01:44:28 pm: Philo, what year filler neck and hose did you go with?
-Thanks!
Title: Re: Filler neck trouble!
Post by: philo_beddoe on August 21, 2017, 04:12:39 pm: Sorry to get back so late. I just picked the option for my year, '77. I was surprised at how good the quality and fit was.
(https://uploads.tapatalk-cdn.com/20170821/833b394e4ddcc5a02a4bbaf36091b31e.jpg)
(https://uploads.tapatalk-cdn.com/20170821/74f2bb06e0b46ed2f9be88059515df60.jpg)
(https://uploads.tapatalk-cdn.com/20170821/721cda065d04ceb27e7a0aec34a74283.jpg)
Title: Re: Filler neck trouble!
Post by: philo_beddoe on August 21, 2017, 05:04:20 pm: Sorry, i thought i was being careful about mentioning "them"