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73-87 Chevy _ GMC Trucks => Performance => Topic started by: BlackTomC on February 19, 2017, 01:47:08 PM

Title: Holley Sniper Fuel System Setup
Post by: BlackTomC on February 19, 2017, 01:47:08 PM
Hey guys, I've got a bone stock 76 GMC suburban, just picked up the Holley Sniper TBI kit and wanted to know what needed to be done to the gas tank in order to make this thing work. A friend on mine mentioned installing a different sending unit, I can hook it all up I just don't know what to get. Thanks.
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on February 19, 2017, 04:34:42 PM
How much lbs. does the Sniper system require for the pump?
Title: Re: Holley Sniper Fuel System Setup
Post by: BlackTomC on February 19, 2017, 09:43:06 PM
Looks like 60psi, kit was the "master kit" so it came with fuel line, filters, the pump and tons of different fittings
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on February 20, 2017, 06:01:28 PM
If you have a stock 76 setup, then the simplest thing may be to use a fuel pump reservoir and not even mess with the stock tank.


Title: Re: Holley Sniper Fuel System Setup
Post by: Captkaos on February 20, 2017, 08:47:02 PM
Run a 87-up sending unit and run a EP381 pump in it.
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on February 20, 2017, 10:51:52 PM
Run a 87-up sending unit and run a EP381 pump in it.

But then, what about baffles?
Title: Re: Holley Sniper Fuel System Setup
Post by: Captkaos on February 20, 2017, 11:13:10 PM
I personally would run hydramat in the bottom of it.
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on February 21, 2017, 06:46:56 PM
Wow.....ok.  So i guess you don't need baffles anymore:

https://www.holley.com/products/fuel_systems/hydramat/
Title: Re: Holley Sniper Fuel System Setup
Post by: VileZambonie on February 21, 2017, 07:24:27 PM
You don't need them anyway if you keep the tank over 1/4
Title: Re: Holley Sniper Fuel System Setup
Post by: Captkaos on February 22, 2017, 09:27:04 PM
Ditto on what Vile stated.  Hundreds of these running around without them. 
Just don't do any parking lot cone races in it and expect it not to slosh.
Title: Re: Holley Sniper Fuel System Setup
Post by: BlackTomC on September 12, 2017, 10:21:39 AM
Quick update guys, the Sniper has been installed, the Suburban runs incredibly well. Amazing throttle response, zero hesitation during startup/idle, accelerates much faster now. Thanks to the folks on this forum who put up with all my questions regarding the build.
Title: Re: Holley Sniper Fuel System Setup
Post by: fitz on September 12, 2017, 05:15:10 PM
Did you run the inline pump or install one in the tank?
Title: Re: Holley Sniper Fuel System Setup
Post by: BlackTomC on September 13, 2017, 09:17:24 AM
I ended up installing an inline pump (included with the Holley Sniper Master Kit), came with all the fittings, pre-post fuel filters and tons of hose/hose clamps.

Exceeded my expectations.
Title: Re: Holley Sniper Fuel System Setup
Post by: Boonie on September 14, 2017, 11:31:19 AM
any pics of the installed unit? looking into one of these for my 74. according to holley, I can use this system and still use the stock air cleaner for a stock look. 
Title: Re: Holley Sniper Fuel System Setup
Post by: Smokehouse on September 01, 2018, 03:26:34 PM
What mileage are you getting now with the efi kit
Title: Re: Holley Sniper Fuel System Setup
Post by: Smokehouse on September 16, 2018, 09:47:45 AM
I would like to know too. I just bought a 78 burb. I want to do it because of the ethanol gas. these days carbs don’t like it very well specially if they sit. On any of my classics I like to pull the tank and coat them so ethanol doesn’t eat them up and you don’t have to worry about a piece of rust clogging up and starving your motor specially if they have sat for awhile before you bought it.
Title: Re: Holley Sniper Fuel System Setup
Post by: 86LSK10 on September 17, 2018, 10:43:42 PM
I personally would run hydramat in the bottom of it.

Question. I’m replacing the tank for my 86. It has an ls swap.

So I prematurely ordered a new poly tank.

I’m going to order an 87 pickup. And do the ep381 pump.

Now I’m regretting getting the poly tank because it has no baffles. If I do this hydra mat. What do I need to connect it to the pump. It seems the pump doesn’t have an inlet barb or something to Hook up to.


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Title: Re: Holley Sniper Fuel System Setup
Post by: VileZambonie on September 19, 2018, 03:55:11 AM
I'm sure you could sell or return the tank and get the one you want for less money and hassle.
Title: Re: Holley Sniper Fuel System Setup
Post by: 86LSK10 on September 19, 2018, 06:17:31 PM
Ya I already did. Got a spectra for an 87 which I’m gunna coat with por15. Call it a day


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Title: Re: Holley Sniper Fuel System Setup
Post by: VileZambonie on September 23, 2018, 07:12:57 AM
You are going to coat the gas tank with POR15? Don't do that!
Title: Re: Holley Sniper Fuel System Setup
Post by: Smokehouse on September 23, 2018, 10:10:59 AM
I always use that red cote that you get at oreillys, but he might be thinking por15 dues make a gas tank sealer too.
Title: Re: Holley Sniper Fuel System Setup
Post by: dq@oaklandpark on April 06, 2021, 03:50:08 AM
BlackTom C , any chance you can post up some images of where you mounted the fuel pump please? I am looking to do this same installation myself and some ideas on pump mounting would really help. Thanks.
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on September 12, 2021, 07:45:03 PM
Just an update, Holley has bolt in tanks with pumps installed for squares:


https://www.holley.com/products/fuel_systems/fuel_tanks/efi_conversion_fuel_tanks/parts/19-157
Title: Re: Holley Sniper Fuel System Setup
Post by: ehjorten on September 13, 2021, 10:13:33 AM
Spendy solution. I would just do as the Captain says and use the EP381 fuel pump with the '87 sender. You have to either break off two little plastic tabs on the EP381 pump, or you can modify the steel base-plate on the sender that supports the pump, but it is really simple.
Title: Re: Holley Sniper Fuel System Setup
Post by: 1980K20 on September 14, 2021, 02:40:33 PM
I put in the holley tank, original had a lot of rust. The efi is awesome, always a fast start! Lots of torque and horsepower on the dyno.  Tank seems to work fine, but I've not yet been in the road.

Mark

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Title: Re: Holley Sniper Fuel System Setup
Post by: fitz on September 14, 2021, 06:45:25 PM
Just an update, Holley has bolt in tanks with pumps installed for squares:


https://www.holley.com/products/fuel_systems/fuel_tanks/efi_conversion_fuel_tanks/parts/19-157

Do they make 1 for the 73-91 suburban?  I looked online but didnt see 1?
Thanks
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on September 14, 2021, 06:58:09 PM
Just an update, Holley has bolt in tanks with pumps installed for squares:


https://www.holley.com/products/fuel_systems/fuel_tanks/efi_conversion_fuel_tanks/parts/19-157

Do they make 1 for the 73-91 suburban?  I looked online but didnt see 1?
Thanks

Yes:
https://www.holley.com/products/fuel_systems/fuel_tanks/efi_conversion_fuel_tanks/parts/19-179


But thinking about the using an 87 and up sender and ep381, which appears to be a stock hi-pressure gm pump(?)  may be the simplest, easiest way.   Although, i would want either the hydramat or even put in my own baffles.




Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on September 14, 2021, 07:00:28 PM
i'm getting more comfortable with the concept of installing an in-tank pump for applications where there is no aftermarket bolt in deal---like holley.   Or, even in situations where there ARE bolt in solutions.


So how do we make sure  we don't blow ourselves to the moon if we weld on the tank, or possibly even cutting/drilling on it?
Title: Re: Holley Sniper Fuel System Setup
Post by: fitz on September 14, 2021, 07:38:13 PM
Thanks for the quick response Stewart.
Wouldn't the 87 and up TBI motors have baffles in the factory tank? Would the aftermarket replacement tanks come with these?
Title: Re: Holley Sniper Fuel System Setup
Post by: ehjorten on September 15, 2021, 08:57:50 AM
'87 and up factory and replacement tanks come with the baffles. The issue can be what year of truck are you replacing the tank on. I am sure someone will chime in with the correct information, but in the earlier years the tanks and fuel fills had a smaller diameter. At some point in the early 80s they went to a larger diameter fill. This may have been '79 when they went to the fuel door in Chevy. I think GMC may have been a little earlier? Not certain. Anyways...if you use a '87 tank on an earlier truck you may have smaller diameter fill on your fuel fill than on the tank. This could be fixed with a custom solution like an adapter to go from one size rubber hose to another or cutting and welding on your fuel fill, but wouldn't work with stock components. You are definitely going to do it cheaper than a Holley EFI tank, but it depends on how comfortable you are working on these systems and with making minor mods.
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on September 15, 2021, 06:02:06 PM
Thanks for the quick response Stewart.
Wouldn't the 87 and up TBI motors have baffles in the factory tank? Would the aftermarket replacement tanks come with these?

Yes, the Holleys have baffles.  Reading will set you free........ ;)

As far as the model year compatibility, i think holley realized this as there is a part # for 73-81 subs and then another for 82-91.


Doing some more reading myself  ;), i see that the holleys come with a 60 lb. pump.  In this case the price difference between new vs. retrofit is narrower although you could probably still save a few hundred by DIY.

But the holley is brand new and seems so well engineered.   i find them difficult to resist.....
Title: Re: Holley Sniper Fuel System Setup
Post by: fitz on September 15, 2021, 08:23:16 PM
Thanks for the quick response Stewart.
Wouldn't the 87 and up TBI motors have baffles in the factory tank? Would the aftermarket replacement tanks come with these?

Yes, the Holleys have baffles.  Reading will set you free........ ;)

Good point.  I have done more reading and watched more youtube videos on the holley/msd/fitech fuel injection kits than I care to admit to.
My question about the tanks was to see if an aftermarket 40 gallon tank from a company like Dorman would be a better option than the 25 gallon tank from holley.  Not sure I'd be happy giving up the 15 gallon capacity differance.
It seems like a lot of people spend about $3k on the fuel injection conversion when it's all said and done.  Just trying to do my homework so if I go that route, it's well thought out and not something I'd regret.
Title: Re: Holley Sniper Fuel System Setup
Post by: Stewart G Griffin on September 22, 2021, 09:37:06 AM
You have a good point;  i didn't realize there was a 15 gal difference between stock and aftermarket.  Looks like i need to read more carefully myself...... ;)

If the dorman has the stock baffles, then i would lean towards that one myself.  i think holley kinda feels that most hotrodders aren't going to drive that much, or at  least not as much as a daily driver, so  they figure the capacity doesn't need to be that high?


Of course, a simpler way might be to use one of the "fuel reservoir" setups from 'brock and i think either FAST EFI or Fitech has one.
This is not the cheapest way, but likely the simplest way.   i think my gig is that i'm discovering that i really don't enjoy working on cars as much as i thought i would.   i would rather drive.   i don't seem to be able to get up from the floor as quickly and easily as before----no i don't have a lift yet.  So, my gig is that i just want to  get it running asap---and willing to pay more for it.



Title: Re: Holley Sniper Fuel System Setup
Post by: VileZambonie on October 30, 2021, 05:38:01 AM
The EFI tanks aren't really baffled, it's more of a well that is located beneath the pump assembly.