Question about 1999 GMC Sonoma

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Put a new fuel pump&filter in 1999 gmc sonoma&it won't start

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Is the pump getting power? Is fuel being injected? Do you have any OBD2 fault codes in memory on a fault code test from the diagnostic port under the dash?

Posted on Dec 14, 2016

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Posted on Jan 02, 2017

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1 Answer

Won't start


Check the fuel injectors, with the key on one side of the two wire connector will have battery voltage, if none is present then check the ECM fuses in the underhood fuel box.

Jun 22, 2017 | 1999 GMC Sonoma

2 Answers

The gmc will not start on first turn of key, you have to turn it on and off several times be for it will fire and then start?


time for a new fuel pump sounds to me .u might try replacing fuel filter .but if that helps it wont be long for the pump.hope this helps

Nov 14, 2010 | 1997 GMC Sonoma

1 Answer

I have a 1994 GMC Sonoma 4.3L Votec we have installed new fuel pump ran for a couple of weeks. Now it wont start we have spark but still not starting?


If the filter is not seated on the new fuel pump properly or has fallen off after installation it will ruin the pump immediately. I have seen many people do this. It is a very common problem when changing the fuel pump.

Oct 28, 2010 | 1994 GMC Sonoma

2 Answers

Hard start on 99 GMC Sonoma 2.2 ?


You need to have fuel and spark. Check that both are present during start-up. Since the truck is an older one I would be prone to suggest, maybe you need a new fuel filter and or fuel pump. The fuel line pressure needs to be over 33psi. Test to verify. Take a look at the maintenance history. When was the last tune-up. Also if the Crank pos. sensor was failing that too could cause a hard start.Well let me know how it goes and if I can help some more.

Apr 28, 2010 | 1999 GMC Sonoma

1 Answer

Engine won''t stay running,already replaced fuel pump


try a new fuel filter as well if the pump can't get fuel to the motor it won't run. You may have crud in the tank too. you need to find out if the fuel is getting to the motor.

Feb 16, 2010 | 1994 GMC Sonoma

1 Answer

Is it fuel pump again


Yes the fuel pump and some dirts might be in the fuel system (i.e. the tank, fuel hose, fuel filter)

Good luck.

rate this please

Jun 02, 2009 | 1999 GMC Sonoma

5 Answers

2001 GMC Sonoma Engine stopped while driving


sounds like it could be plugged injectors or a timing problem.

Oct 27, 2008 | 2001 GMC Sonoma Extended Cab

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