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1979 GMC Sierra wont start!!HELP


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kaeto
New User

Oct 11, 2012, 6:21 PM

Post #1 of 4 (2084 views)
1979 GMC Sierra wont start!!HELP Sign In

I was driving home and gas guage went to full and truck spuddered to a stop. I changed fuel pump and it still wont start. I dont know if a new gas tank might be the answer?


nickwarner
Veteran / Moderator
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Oct 11, 2012, 6:34 PM

Post #2 of 4 (2063 views)
Re: 1979 GMC Sierra wont start!!HELP Sign In

Have you checked to see how much fuel is flowing before automatically thinking its a fuel problem? Unhook the line from the carb and hold it in a jar while someone cranks it. Is it barely trickling or flowing solid? If nothing or next to nothing comes out, try running a line from the inlet of the pump into a gas can, see if it will suck from that and run. If so, something in the fuel lines or in the suction pipe of the sending unit is plugged. This is plenty old enough to have a bunch of crap in the tank plugging up the sock, but you can clean those tanks out so if it isn't leaking there's no reason to change it.


kaeto
New User

Oct 11, 2012, 6:37 PM

Post #3 of 4 (2059 views)
Re: 1979 GMC Sierra wont start!!HELP Sign In

I have not did that. I will as soon as i can tomorro morning. If it is the fuel line do i need it replaced or is there any way to clean it out and keep it? Thank you for the advice i greatly appreciate it.


nickwarner
Veteran / Moderator
nickwarner profile image

Oct 12, 2012, 7:34 PM

Post #4 of 4 (2010 views)
Re: 1979 GMC Sierra wont start!!HELP Sign In

Lines would only plug from rust. New fuel line is cheap. It would make no sense to try to save 33 year old line. The thing you need to do is isolate the cause. If the pump isn't putting out fuel, unhook the inlet and run a line from there to a gas can full of gas.See if it will draw in fuel and pump it out. If not, your new pump is junk or the issue is inside the timing chain cover that drives it. If it will pump and run on a fuel can, you need to unhook the fuel line at the tank and try to blow compressed air through it. If little to none will get through, you have a junk line. If it blows through freely, you have now isolated it to the tank and need to drop it to see what is going on inside.






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