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Old 05-12-2009, 09:24 PM
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sbc losing something

i have a 1980 k5, everything is new. but when i get driving it will fall on its face and act like its running out of gas when running down the road at a steady pace,replaced fuel pump , distributor,fuel filters, and carb. still the same prob,, any ideas

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Old 05-12-2009, 09:29 PM
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is the bowl filling up in the carb ?

perhaps there is a kinked line or hose under the truck or at the fuel pump,

check hoses there and at the tank for a kink etc.

i have found this problem in the past when this problem has happened.

it doesnt take much either, the pressure is only 7-9 psi when non-restricted


check everything carefully under the truck

if still no luck then i would remove the hose at the fuel pump from the frame rail and get an air hose and pressurize the fuel tank with a rag in the filler and see if a crud clog comes out

good luck
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Old 05-12-2009, 09:41 PM
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i pulled the tank but i didnt blow thru the lines,another thing is when i turn it off the fuel filter between the carb and mech. pump drains down is that normal one guy told me it could be the pick up coil, but i changed out the hole dist. and i still have the same prob.
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Old 05-13-2009, 05:58 PM
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Check the fuel pressure with a gauge while it is happening. Dont buy anymore parts until you know what the issue is.

It sounds like fuel,could be the pickup in the tank is partially plugged or a twisted line. A fuel pressure test will prove it one way or the other.
Artificial Intelligence is no match for Natural Stupidity

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Old 05-14-2009, 10:34 AM
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check cat. converter.i know it sounds wierd, but company truck had same sounding problem.tried the same thing to fix it, still same problem.boss claimed NO WAY it could be converter,when he left for a couple of hours, we built a tube and changed with converter. worked good and is still in truck. our county in az. considered rural .no smog laws yet.
if exaust can't go out, pressure will build flow no run.

Last edited by bobjob; 05-14-2009 at 10:39 AM.
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