Question about 1989 GMC S-15 Jimmy

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No fuel to throotle body truck will not start. Only start if prime the throttle body then shut off

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You can attempt to run it w. starting fluid to make sure the engine is running aside of fuel issues. You may need to replace the fuel filter/regulator if it is a single piece. If it's definitely not getting fuel, its either a pump/filter/regulator issue, or an electrical issue. You can generally hear the fuel pump running when the engine is on if you are close enough to it. you can almost always hear it prime. if all is good and the fuel pump can be determined to not be at fault, change the filter and try again.

Posted on Aug 05, 2010


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1 Answer

Start and quit running I can spray gas in the throotle bottle and it will say running while I am spray it

Must be your fuel pump has quit working. There should be fuel under pressure in the line to the throttle body, just by turning the key to on, not start. Not real high pressure like in multiport injected engines. Throttle body injection runs on about 20psi. If no pressure in your lines, find out why the pump is not working.

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This happened to me I had to spray Starting fluid everytime eventually. Starting fluid wouldn't work after awhile. Its the fuel pump. Even though it comes on and works its not producing enough fuel pressure to start the engine. It's probably giving about 12-13lbs of pressure but it needs atleast 14lbs. of pressure. And a word of advice to buy a ACDelco original fuel pump if you don't want to have to replace it again in 1-2 years, it's more expensive but will last.

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The way to prime the fuel pump is to turn the key on.This will make the pump run for 2 seconds then turn off.Shut the key of for 10 seconds then turn it on again.You may have to do this a couple of times to get the fuel to the throttle body.Also when you turn the key to the start position the pump will run til you let go of the key.Hope this helps.Good luck.

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This sounds like a fuel pump is starting to fail. The system is designed to keep, or at least prime rather quickly to allow for efficient starting. If the pump is begining to fail or, has a plugged fuel filter (which will kill a fuel pump), it may create this issue. One other item to check is the coolant temperature sensor. If it is reading warm when it is cold, this symptom will occur.

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4 Answers

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i have the same problem on a 98 jimmy 4.3 4x4.
i replaced the fule pump and have good pressure.
new wiers & coil (good spark) no MIL & no codes.
will only start when primed. it will run & drive all day
with no problems.
but once it has been turned off (warm or cold) i will
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i swaped the mass air flow and throttle body but i still have
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should i swap out the intake with the injectors?
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1 Answer

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Did you change the fuel presure regulator located in the throttle body?

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