"GRUMPY< my throttle body 350 v8 injected pick-up, just stopped running , it starts if I spray lighter fluid in the throttle body and I hear the pump run, but Im stumped, what do I check?
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start with pulling trouble codes and reading these links and SUB LINKS, get a multi meter and a shop manual, and verify your getting fuel pressure at the throttle body or fuel rail that matches what the shop manual indicates.
a simple step bye step approach where you verify function of each separate component will quickly isolate and allow you to fix the defective link in the process. don,t guess, check, and verify.
check all your fuses if you don,t have any trouble codes , if you do have trouble codes use the SHOP MANUAL to locate the problem
just because you hear the pump run does not indicate its providing fuel flow or pressure, and even if it pumps fuel it won,t provide pressure until the fuel pressure regulator restricts flow back to the tank.
throttle body injection requires a fuel pressure regulator to provide a certain minimal fuel pressure level to get the injectors to flow fuel, if the fuel pressure regulators defective the fuel flows past the throttle body injector basically unrestricted back to the tank and theres no pressure available to spray fuel into the engine, so ID strongly suggest looking up the factory suggested fuel pressure and checking your getting that at the injector/throttle body, with a reliable fuel pressure gauge, many older throttle body injection systems operate at about 14psi-18 psi , some of the more recent versions operate at 55psi-60 psi, but check your shop manual or verify the expected pressure level
http://www.harborfreight.com/fuel-injec ... 92699.html
READ THESE LINKS IN THIS THREAD POST, IF YOU HAVE QUESTIONS ASK! [/color]
http://www.howstuffinmycarworks.com/GM_ ... ssure.html
http://www.ehow.com/how_6637877_change- ... lator.html
http://www.ehow.com/list_7907357_fuel-s ... erado.html
http://www.underhoodservice.com/issue/a ... ntid=39820
if you find fuel reaches the throttle body thats good but it also must have pressure to work at the injector/throttle body , and a defective fuel pressure regulator will cause the symptom your describing, temporarily blocking the return line will be a quick test, because restricting flow will allow required pressure to build , if it runs its a good indication the pressure regulators defective
your fuel supply is laid out in similar fashion to this , but with a single or duel throttle body injector vs the multi port bank of injectors like in a TPI