Author Topic: Idle jets plugging on edelbrock carb 1406 model  (Read 181 times)

Offline fiddler

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Idle jets plugging on edelbrock carb 1406 model
« on: November 30, 2017, 06:20:26 PM »
So I have a 1974 chevy half ton stepside.  (C10).  Has a 350 with an edelbrock carb, I think the model is a 1406 carb.  The idle jets are repeatedly plugging up.  I open the jets by removing the needle valves and spraying with carb cleaner then compressed air.  I replace the needle valves and readjust and everything is fine for a bit then I have to do it again.  Sometimes 50 or a hundred miles and sometimes a few hundred miles.  I thought maybe the gas line was coming apart so I replaced it all and replaced all 3 filters in the line, but I am still seeing the idle jets plug.  (Symptoms...I get a rough idle, and find that one of the needle valves has no effect on the idle when I screw it in or unscrew it).  Anybody seeing this or have any ideas?  This problem is so common that edelbrock has a youtube on it.  I may need to switch carburetors
to a more trouble free model.  Any suggestions??   
Ricky

Offline VileZambonie

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #1 on: November 30, 2017, 08:53:27 PM »
Very common especially if there's junk in the tank or bad gas. Where and what kind of fuel filter are you running?
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Offline fiddler

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #2 on: December 02, 2017, 11:32:52 PM »
I have a filter at the input to the fuel pump and two filters afterwards.  The filters on the output are the standard glass filters with replaceable mesh filter.  I don't have the packaging so I don't remember the brand names.  Is there a "best" fuel filter?  I would gladly install one if I heard there was one out there.
Thanks much for your help.
(So the redundant filters were already in the truck when I replaced the gas line.  I just went with what I had and replaced everything rather than re design.  Maybe better to get one real good filter at the output of the fuel pump.)

ricky 
Ricky

Offline fiddler

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #3 on: December 03, 2017, 12:17:51 AM »
So this is the fuel filter being used in the truck.
« Last Edit: December 03, 2017, 07:22:13 AM by VileZambonie »
Ricky

Offline VileZambonie

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #4 on: December 03, 2017, 07:23:38 AM »
So you have 3 of those?

I would throw those in the trash, you only need one filter and I would put it in after the pump before the carburetor.
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Offline fiddler

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #5 on: December 03, 2017, 03:38:00 PM »
Any suggestions as to what type of filter I should purchase?  If these aren't doing the job I hate to buy another that doesn't do the job.....

thanks for any advice,

ricky
Ricky

Offline VileZambonie

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #6 on: December 04, 2017, 02:38:57 PM »
Any universal quality 3/8" filter will do the trick. A lot of guys prefer the transparent filters but any parts store will have them in stock. Put it in a place where you can easily service it and where it is away from danger.
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Offline roundhouse

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #7 on: December 07, 2017, 04:54:53 AM »
You might wind up with a new tank

I've had a couple of older vehicles where the filter would clog every 25-50 miles and I had to replace the tank

It had so much rust and dirt in it

I used the clear plastic 3/8 filters so I could see what it was catching

A new tank from rock auto is less than$100

Offline Engineer

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Re: Idle jets plugging on edelbrock carb 1406 model
« Reply #8 on: December 08, 2017, 02:14:06 PM »
You might wind up with a new tank

I've had a couple of older vehicles where the filter would clog every 25-50 miles and I had to replace the tank

It had so much rust and dirt in it

I used the clear plastic 3/8 filters so I could see what it was catching

A new tank from rock auto is less than$100


My son had a ‘79 GMC that we ended up replacing the tanks on. 50 miles to the fuel filter was a pain.
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