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#1 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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problems running
so ive had my 72 swb chevy for a few months now and it has been running great. no issues at all. and in the past week it has started sputtering while im driving and then dying. sometimes she comes back on her own other times i have to start her back up after keeping my foot on the gas while i turn her over. i just swapped the spark plugs this morning and put carb cleaner in my tank to see if that would help. i have new wires too. my only thought at this point is that because the fuel filter is before the fuel pump that it is some how not getting enough fuel in addition to possibly dirty fuel and a dirty fuel filter. any thoughts on other causes would be great help.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#2 |
Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,188
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Re: problems running
Sounds like you have a pretty good idea of what to check. Start with the filter, consider cleaning your tank if there's a lot of junk in it.
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#3 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
i was gonna try either draining the tank or trying to burn through it before swapping out the filter although i have 3 spare filters for it. im not too happy about it having a glass cylinder around the filter so i might get a new filter setup. and a buddy had a holley 75ocfm carb to swap out with my edelbrock carb that i have right now. we will see what happens though.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#4 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
so ive swapped out the fuel filter and my tank is getting near empty and i thought that my truck was running better but she died out again on me today. looks like it might actually be the fuel pump. so gonna get a new one to put in and see if that fixes it
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#5 | |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: problems running
Quote:
Take the hose off the fuel pump that feeds the carb and put on a length of hose and point it to where it go's into a container, start cranking the engine and make sure your getting gas into the container, if not the problem is before the pump, maybe the pre filter sock inside the tank. if your getting gas the problem is after the pump. If you know the fuel pump pumps ok then the next time it starts to die don't try to keep it running, just let it die, Then take off the air cleaner and see if by moving the throttle it squirts gas into the primaries, if not its a supply problem, needle and seat float related, or between the carb and fuel pump. You mentioned that it dribbled? If it doesn't squirt then you found part of the problem. If it does squirt it would point to dirt in both the idle circuit and main jets, they rely on the vacuum to pull the fuel into the primary's or secondary's, if there is dirt in there the orifices will get plugged. My bet says that you just need to pull the carb apart and clean it up because you have a lot of crap inside plugging it up. I don't know if your engine is stock or built but a 750 Holley may be a little too big. Got another question for you to think about, when it dies have you checked for good hot spark? just because you changed the plugs and wires doesn't mean you have good spark, if your still running points and condenser they could be in need of changing, and if the coil is getting hot it could create enough heat to generate enough resistance to weaken the spark as well, while your there look for any possible frayed wires running to the coil.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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#6 |
Registered User
Join Date: Sep 2013
Location: Mount Morris,NY
Posts: 788
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Re: problems running
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Dean 1972 Custom Camper c/20 5.3 LS swap in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=610187 in God we Trust ![]() |
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#7 |
Senior Member
![]() Join Date: Apr 2013
Location: Houston,Tx
Posts: 780
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Re: problems running
Is your filter full of trash....
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#8 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
The old filter was a little junked up but the new one still looks good. I've got a new fuel pump and a few other parts on the way so I'm hoping that fixes it.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#9 |
Registered User
Join Date: Jan 2014
Location: Tulsa, OK
Posts: 360
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Re: problems running
Check your gas tank for trash. I had that problem a couple of weeks ago. New gas tank but had crap in it clogging up the pick up tube. I replaced many ignition and fuel delivery parts before I figured it out. I initially wrote off the tank being an issue since it was new.
Remove the inlet line from the gas tank at the fuel pump. If you aren't getting a full solid stream of fuel through that line, blow air through it with your compressor. When you hear the gas bubbling in the tank, stop the air, and reattach the gas line to the pump. Pull out the float and shine a flash light in the hole to see if you can see any trash. I still don't know what was in my tank. It was a dark red color and disintegrated when I tried to pick it up to look at it. Removed the tank flushed it with water and let it dry two days before I reinstalled it. So far no more problems. Last edited by Hugh Mongus; 02-25-2014 at 11:42 AM. |
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#10 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
Yeah still not too sure what's up. I siphoned most of my tank down and it was all clear. Put in a different fuel filter with a plastic window rather than glass. My buddy is hooking me up with a holley 750cfm carb so I'll see if tha helps. I'm having a hard time finding a new mechanical fuel pump with a return line on it. Most don't have that and I was wondering if that would affect her running. I just want to get back to driving her again.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#11 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: problems running
Clogged needle and seats, or the accelerator pump isn't pumping fuel. When you move the throttle does the accelerator pump squirt fuel into the primaries? It should be a quick shot of fuel. If it is weak and dribbles out then the pump in the carb is shot. Quadrajet carb?
Gary
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#12 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
It usually looks like it is dribbling out but I'll check it when I get back to my house. I can drive her hard around the block but a casual cruise down the street to work or back and she cuts out and I have to restart her. Hopefully your right and it's the pump in the carb. Yes it is an edelbrock 4 barrel in it right now.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#13 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: problems running
Not sure you are supposed to have the filter before the pump.
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#14 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
I do have the filter befor the pump. So I don't think hat is the issue
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#15 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: problems running
Having the filter before the pump may be causing issue (is what I meant above).
Does the problem only happen after the truck has warmed up?
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#16 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
Yeah it usually does happen after she is warmed up. I have yet to have it happen while she is sitting in my garage idling. Hence why I'm at a loss.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#17 |
Registered User
Join Date: Sep 2013
Location: Mount Morris,NY
Posts: 788
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Re: problems running
Dosent the filter Go after the pump? that may be the issue
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Dean 1972 Custom Camper c/20 5.3 LS swap in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=610187 in God we Trust ![]() |
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#18 |
Registered User
Join Date: Feb 2013
Location: alvin, texas
Posts: 622
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Re: problems running
I run filters before and after the pump with no problems. if you run one before the pump it needs to be a high flow filter. I run a 10" stainless filter from speedway .if you run a standard universal paper filter before the pump it doesn't take much to stop or severely restrict the flow from a mechanical fuel pump. I would also check your fuel pressure, my autozone mechanical pump was putting out 10psi so I had to run a regulator with it
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1967 C10 lwb two tone, 305 & rat fink style floor shifted 700r4, 20" steelies 2004 2500HD utility bed aka Brutus |
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#19 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
I'm running a k&n stainless right now. It's pretty small. Before that it was a mr gasket with a glass cylinder so I swapped that out. I do want to run filters before and after though.
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#20 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: problems running
Process of elimination, you might consider taking the fuel filter before the pump off and see if the problem still persists.
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#21 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
Tried that I'm on my third filter and all three have been different. Problem still exists
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#22 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: problems running
You've removed the filter entirely and ran it with only one filter (after the pump)?
I reread your first post - You poured carburator cleaner inside of the gas tank?
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#23 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
well there is about 5 gallons of gas in the tank right now so im sure there is fuel. when i took off the connection for the pump inlet fuel free flowed out of that pretty well with no efforts. i havent tried moving the filter after the pump just yet. i agree that the 750cfm holley is gonna be a huge carb for this motor but it was free. so that is always nice. yeah i do need to check if its a vacuum leak too because that would cause a few issues as well. on a side note anyone know what this is on my intake below the carb. showed it to a few buddies but no one has seen plates bolted onto intake runners before. btw its an edelbrock manifold
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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#24 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: problems running
It is a heat shield. You should remove the filter BEFORE the pump, not after.
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project: "my happy mess" Last edited by litew8; 03-09-2014 at 06:22 PM. |
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#25 |
Registered User
Join Date: Oct 2013
Location: Bremerton, WA
Posts: 287
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Re: problems running
i know that the sheet metal is a heat shield im refering to the 2 plates below it on the intake runners themselves. im gonna check for vacuum leaks next just to check
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1972 Chevrolet swb fleet side. - SOLD 2018 Toyota Tacoma but hunting for another C10 Link to my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=607303 Instagram: https://www.instagram.com/72c10shortbox/?hl=en |
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