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Username Post: Fuel delivery issue        (Topic#346242)
Flying_Dodo 
Silver Supporting Member
Posts: 19
Flying_Dodo
Reg: 07-11-17
07-27-17 05:02 AM - Post#2701616    

So was out driving around a little yesterday.
Things were going OK, if maybe running a little warm.
Filled up the tank for probably the first time in many years (this thing sat for a while.)
Driving home, had some power issues, then it died.
I have a large metal (new) fuel filter before the pump, and a smaller (new) clear plastic filter between the pump and the carb.
I could see air bubbles coming up from the pump, and looked like I was not getting good flow (air at the top of the filter, so obviously not delivering up to the carb.)
Finally the air bubbles stopped and I was able to get it home, but it died right at my house, and I can not get the clear filter to fill up and deliver fuel to the carb.
Could be a number of things, my ideas from most likely to least likely, let me know if I'm missing something or wrong on any of these:

1.) Fuel pump gave up (new holly pump is only a 100 bucks)

2.) Filling up the tank pushed a crapton of rust into the first fuel filter and is blocked (the filter I pulled and replaced was a clear one, had lots of rust in it)

3.) Having a filter AFTER the pump that can trap air is causing the loss of flow

I can check #2 real quick, and will do this once it's daylight.

Thanks for the help, I know I'm posting a ton of crap on the site here, but I'm new to old GMC trucks.

I used to be a vintage bike (mostly jap) mechanic, while the concepts are certainly similar, I'm just not familiar with common things on these old small blocks.

I'll buy into the "supporting member" thing here as I reckon I'll be asking lots more questions.



Edited by Flying_Dodo on 07-27-17 05:03 AM. Reason for edit: No reason given.

 
bobschevytrucks.com Ecklers

Flying_Dodo 
Silver Supporting Member
Posts: 19
Flying_Dodo
Reg: 07-11-17
07-27-17 05:15 AM - Post#2701619    
    In response to Flying_Dodo

I think I'm going to pick up another fuel pump and gaskets while I'm out this morning just so I have it in case I need it while testing. Can return it if don't use it.



 
Andy4639 
Frequent Contributor
Posts: 1113

Age: 57
Loc: Liberty, SC
Reg: 08-06-16
07-27-17 08:15 AM - Post#2701639    
    In response to Flying_Dodo

You said it sat a while right?

I know you don't want to hear this but....

My suggestions.
#1 take the fuel sendor out of the tank. Change the sock filter on it.

#2 Take the tank out of the cab and flush it out good with water.

If it's full of rust buy a good used tank are new one. Then change out all the filters as you suggested. If you do the filters first you are going to waste filters if the tank is full of rust.
I know they make a sealer for the tanks you could try also before buying a new or used one.



1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
Flying_Dodo 
Silver Supporting Member
Posts: 19
Flying_Dodo
Reg: 07-11-17
07-27-17 09:56 AM - Post#2701648    
    In response to Andy4639

I've dealt with tank sealers before on old bikes. They just make things worse when they finally detach from the metal.
If I Have to buy another, I'll get a good used or new one.



 
Andy4639 
Frequent Contributor
Posts: 1113

Age: 57
Loc: Liberty, SC
Reg: 08-06-16
07-27-17 01:02 PM - Post#2701677    
    In response to Flying_Dodo

  • Flying_Dodo Said:
I've dealt with tank sealers before on old bikes. They just make things worse when they finally detach from the metal.
If I Have to buy another, I'll get a good used or new one.




Agree I would just buy a new tank to!


1956 Bel Air - LT-1/4l60
1964 SS Impala -350 crate/powerglide
1967 Ramp truck - 350/ 4 speed
1971 C 10 - 6.0 LS / 4l80e 4:10 gears 30 years owner
94 Elderado
2000 S-10
2008 LTZ Tahoe
2011 Treverse


 
Flying_Dodo 
Silver Supporting Member
Posts: 19
Flying_Dodo
Reg: 07-11-17
07-29-17 04:51 AM - Post#2701909    
    In response to Andy4639

So far appears to be clogged filter, pump working after I cleaned out the filter of a ton of rust.
Gonna run this tank down while cleaning the filter, then check to see how much debris continues after that.
If it's still bad, then new tank it is.
On the bright side, I can return the 100 dollar holly fuel pump.



 
bobschevytrucks.com Ecklers

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