Question about 1991 GMC C1500

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My 1991 GMC with a 350 V8 is hard to start. Runs ok once started.

My 1991 GMC with a 350 V8 is hard to start. If I splash a little gas in the throttle body it starts and then runs fine.

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Check fuel pump for proper pressure....Also very common is a bad o2 sensor not allowing enough fuel.

Posted on Jul 28, 2009

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How do I fix and 97 GMC 1/2 ton with a 350 vortec. Runs great once running. Sat for 5 years. If sits more than 5 minutes wont start without shot of starer fluid


have you changed the fuel filter and emptied the gas tank and put fresh gas in? Stale gas will not start as well as fresh gas and there could be water from condensation in the tank.

Mar 29, 2015 | 1997 GMC Sierra

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Ok I am wondering if my motor in my 91 gmc 5.7 l b8 is a vortec or a 350 it has throttle body carb and not sure thought if I could interchange it with an older 350 ..


Here, is what I think you are asking. The TBI intake from a 91 will fit the same size engine from 88 to 95. The Vortec didn't come out till 96 I believe. So if your 91 is the original engine then it is not a Vortec motor. If you want to swap your 5.7 with another 5.7 (5.7 = 350) Then the 88-95 should work, Just double check your sensors and locations as the plugs may be different and or in different locations. I know my 88 GMC and my 94 chevy (both K1500's) were a little different. Hope this helps.

Jan 17, 2015 | 1991 GMC Sierra

1 Answer

Truck will not start it has spark


Sound like there is no gas or little enter the engine.

-Check gas presure and any gas in the carburator?
Yes. The internal pump is won out. Need to replace it.
Q: Where is the internal pump...?
A: It's inside the carburator. (It looks like the toilet plunger)
You can't see untill the cover has been remove.

mai lor

Feb 22, 2013 | 1992 GMC Sierra K1500

1 Answer

My jimmy runs fine once it starts, but i have got to pour a little gas in the throttle body every time to start it


Fuel Pump. Fuel Pumps in some of the newer GMs cannot have a loss of more than 2-3 PSI otherwise cold start pressure is not there.

Oct 19, 2010 | 2000 GMC Jimmy

1 Answer

1994 GMC Jimmy hard to start and runs rough when first started


i think if you checked the sparking plugs and map sensors then check your distributer its maybe not delivering the current nedded to perform the spark to some of the cylinders

May 30, 2009 | 1994 GMC Jimmy

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Hi I have a 1992 silverado with a 350,hard to start.


When it runs really rough is there alot of black smoke? Could be the fuel pressure regulator diaphram, real easy to change on that TBI...

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Wont start my truck


have a 1997 gm sierra pickup want start new plugs new gas filter have spark at the plug pressure on gas line checked fuses v8 350 2 whell dr

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1991 GMC TBI 350 sierra stalls bad


Could be the TPI Sensor or it might be a touch out of timing.

May 30, 2008 | 1991 GMC K2500

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