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12-02-2012, 08:20 PM
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#1 |
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Registered User
Join Date: Jul 2012
Location: AZ
Posts: 125
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New fuel pump partially solved problem
So I have had this issue where I am going down the road at about 45mph or more and the more sill sputter and stall out. Before I replaced the fuel pump it did this all the time. Replaced the fuel pump and took it out today to get gas. It ran perfect until I was on my way home. It stalled out once I was close to the house at about 50mph. Like I said in previous posts I believe I am chasing more than one problem at once and just going down the line.
Now it ran like a champ for the most part until I was almost home. I have replaced- Fuel pump, plugs, wires, rebuillt carb with new accelerator pump. Still need to replace HEI cap and rotor once I find out what to replace them with. Says AC Delco on it (ideas on what I need?). I have no idea how old these are but the previous owner said he had not ran the truck in over a year before I got it. Any more ideas? |
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12-02-2012, 09:02 PM
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#2 |
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Registered User
 
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: New fuel pump partially solved problem
I wouldnt use the AC Delco caps/rotors. They suck IMO. The MSD cap and rotor is inexpensive and reliable. Did you replace the fuel filter ? I would clean out the gas tank and replace the fuel filter if it sat that long. I would also blow compressed air through the fuel lines if at all possible, There may be junk in there and the sending unit "sock" filter if in poor condition may be letting it through...
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72 C20 Longbed 05 1500 Z71 |
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12-02-2012, 09:32 PM
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#3 |
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Registered User
Join Date: Oct 2012
Location: Ravenel SC
Posts: 317
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Re: New fuel pump partially solved problem
I had a similar problem, except it started with my tank, it had rust in it, and it spread through the lines of course. I replaced my tank, cleared my lines and a new filter of course and its been fine since. I would look inside your tank and do what sleepertruck said, clear lines and filter and blow through the fuel pump as well and see what happens.
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Toys/projects Many toys, not enough time to play! My youngest son and I picked up a 69 Chevy C-10 on 1/7/22, this is my second 69, it was 10 years ago that I had my other one. So I’m back!!! 
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12-02-2012, 10:34 PM
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#4 |
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Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: New fuel pump partially solved problem
Filter and try again. You might try a quality wix unit in line rather that the small stock one at the carb. If you have rust issues in the tank you might also think about removing and replacing the tank or at least having it flushed.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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12-02-2012, 11:22 PM
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#5 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: New fuel pump partially solved problem
Yeah, clogged filters and lines are a common problem on these old trucks. I would stsrt by removing the sending unit and checking the sock filter (personally, I prefer to remove it and install an inline filter).
I had a clogged fuel line between the tank and fuel pump that was so clogged with varnish that I wound up having to put a new line on there. It was restricting the flow to a trickle.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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12-02-2012, 11:35 PM
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#6 |
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Hybrid67
Join Date: Jan 2009
Location: Martinez, GA
Posts: 195
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Re: New fuel pump partially solved problem
similar problem with my 67 after purchase. Gunk in rubber line from hard line coming from gas tank through the floor and connecting the hard line to the engine compartment. Ruined two carbs because of the crap in the tank too. Cleaned it out with a gallon of carb cleaner, replaced everything rubber, new fuel pump, filter, and carb. Runs like new now.
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Keep em' Running!  All show.....no go 
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12-02-2012, 11:42 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,542
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Re: New fuel pump partially solved problem
Easy stuff first! Pull the gas cap off, take it for a drive. Could be simple vapour lock.
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12-03-2012, 10:04 AM
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#8 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: New fuel pump partially solved problem
Quote:
Picture shows where the vent valve is and it should move slightly up and down.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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12-03-2012, 01:44 PM
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#9 |
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Registered User
Join Date: Jul 2012
Location: AZ
Posts: 125
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Re: New fuel pump partially solved problem
Hmm interesting. The old pump had a return so i dont think vapor lock was an issue. It runs a lot better with the new pump and i put new rubber lines in. The old ones were clean. Could still be in the tank though. Also the carb wasnt all gummed up. I'll check the fuel tank next. I am wondering if the old HEI could also be a culprit. Also, some of the wiring to the HEI is cracked and i am wondering once it heats up if it is causing a problem.
Last edited by 1972_Buford; 12-03-2012 at 01:52 PM. |
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12-03-2012, 01:45 PM
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#10 |
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Registered User
Join Date: Jul 2012
Location: AZ
Posts: 125
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Re: New fuel pump partially solved problem
Dual post
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12-03-2012, 05:11 PM
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#11 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: New fuel pump partially solved problem
exactly what year and model truck r u talkin about?
71,72 have nonvented gas caps on models with the charcoal cannisters HEI??? has a new wire with a full 12volt supply been trun? the factory original wire is a resistor and does not supply 12volts
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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12-04-2012, 01:11 AM
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#12 |
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Registered User
Join Date: Jul 2012
Location: AZ
Posts: 125
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Re: New fuel pump partially solved problem
72 350. Funny thing is when i first got it it ran great and the stalling problem didnt happen until like a month later. I know full 12 volt or not. I'll check that as well. Problems start when it is fully warmed up. I'll work on the hei next and for venting at the gas cap. Dont see a charcoal canister fyi
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12-08-2012, 10:41 PM
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#13 |
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Registered User
Join Date: Jul 2012
Location: AZ
Posts: 125
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Re: New fuel pump partially solved problem
So I pulled carb back off and opened it up. Found this little bugger sitting in the accelerator pump cup. Piece of old cup partially blocking fuel passage. Ran better this time. I think my last issue might have to do with the secondary tension spring allowing secondaries to open up before they need to. I'll test this tomorrow as i applied more tension on the screw.
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