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My son has a 1989 sierra c1500 TBI that wouldn't start. I opened lower butterfly and put fuel (gas) straight into the intake manifold it starts and stay running but when I shut it off and wait a while it wont start again. I've checked and replaced the fuel filter and pulled the fuel line and noticed when I turn the key on the fuel pump works for aprox 3 sec then shuts off (about 2 to 4 ounces come out in a full stream shooting aprox 3")counter dork at local auto parts claims specs are 9 t0 25lb's (witch sounded rather fishy to me). Is there a "shadetree", "Poorboy", roadside test or rule of thumb for testing the fuelpump???
P.S. I find it strange that once I get it running it runs well while you drive it and tha it pumps for a few sec than stops. any imput will be helpfull thank you.
The actual spec for pump pressure will in the range indicated by the counter guy. Unfortunatly it will be a particular pressure plus or minus 1 psi or less EG 9 +-.5 psi. It sounds to me as if the power feed either from the computor or from the starting circuit is not there. This means either you computor is not seeing the starter turning the engine or there is no power being fed from the start position on the ignition to the pump. Either way you need to get the unit scaned or get a wiring diagram to figure out where to start looking. I have had to wire up a pump overrule switch to avoid buying a computor in one of my beaters. Was holding the buton down and cranking to get a start. Good Luck
I had an issue like this on a 87 R10... would run and die and would start back up and run for a few and die.... had to pull the gas tank and install new fuel pump and clean the tank out....the pump has a prefilter and the pump would turn off after a few sec's when it couldn't pump out the fuel.
I got some bad gas into the tank and
truck stop running,I cleaned out the
gas tank and replaced the pump and
filter,now there is no power getting
to the fuel pump,I tried replacing the
fuel relay with no luck.
Done the whole fuel line from front to back to filter new fule pump tried every thing we know to do and the new pump doesnt kick in. Any ideas?
Thank you
I had ALL these problem last month in my 1989 GMC 1500 I dropped the tank cleaned it and put a new pump in the tank. Installed everything. NO POWER nothing would happen! So I took the Bed of the Truck off and noticed a little black ground wire wasn't grounded out to the frame. Hooked that up and LOW and Behold it runs like NEW.. 2days worth of work and I am back out on the ROAD...
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