Question about GMC K1500

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Fuel injector pump not working

1994 GMC K1500 5.7L. Until 2 days ago, the truck would start fine when cold, but not hot. Originally I confirmed no fuel pressure. Brought it to a shop, they found a clogged fuel filter and replaced. Also said all connections and grounds were good. Problem persisted and same shop suggested a bad pump, so I replaced that and the relay myself. Confirmed good connections and ground at the pump. Problem of no fuel pressure persisted. When it did start, engine was strong and idled well. Only sense of a problem was it would very nearly die coming up to a light occasionally, but a tap on the throttle would bring it back to life and would then idle just fine. Cap is due for a change, but cleaned it up in the mean time. Now the truck won't start at all. I know the TBI engine can throw some curves in this area. Could a faulty coil/distributor/ignition module cause this? Anything else I should be looking at?

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If It has fuel injection it can be the fuel pressure valve, that hold the fuel pressure on the reel with the injectors. you can check it bi clamping the fuel return line so it can not flow (to see if the fuel is just going around back to the tank with out making pressure), and se if it can run but it is just to check it out, the valve can be stuck after the fuel filter was full and pass some dirt thru the system. but i don't know this type of car, just passing some ideas

Posted on Feb 15, 2014

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Posted on Jan 02, 2017

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SOURCE: GMC 4.3 runs fine

EGR Valve

Posted on Dec 23, 2008

66 chrgr
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SOURCE: My truck is dumping too much fuel it's TBI 2.5L

if you haven,t replaced the coolant temp sensor that would be the next steps i would try .if it is reading minus 40 degrease . it will dump the fuel.check for open in this circuit.if you have a scanner see what the temp is. _

Posted on Feb 22, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

hawkwindbear
  • 5 Answers

SOURCE: 1987 chevy engine problem

you have to reset base idle see manual at library for procedure

Posted on Jul 19, 2009

  • 5 Answers

SOURCE: 1987 Chevrolet S-10 Pickup1987 chevy s10 2.5l tbi

Check the trottle body postioning sensor...

Posted on Jul 19, 2009

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