1996 GMC Jimmy BBEVAP

YAMILV

MEMBER
1996 GMC JIMMY
6 CYL
4WD
AUTOMATIC
169,000 MILES

WHEN IM DRIVING SOMETIME IT HESITATE. WHEN I GIVE GAS IT SHOT DOWN TWICE AND NOW DOES NOT TURN ON. THE OEM DOMESTIC SAID A COUPLE PROBABLE CAUSE.1 DEFECTIVE OR LOOSE FUEL CAP.2EVAP CANISTER OR HOSE CRACKED, NOT CONNECTED.3PURGE OR VENT SOLENOID DEFECTIVE.4VACUUM LEAK AT ENGINE. WHAT YOU THINK IT COULD BE.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,544 POSTS

Those problems will cause the check engine light to come on, but wound shut down the engine. Before replacing parts, have the system fogged to identify where the leak is located. Otherwise, you will be looking for the leak and never find it.

Let me know what you find.

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Monday, October 5th, 2009 AT 8:53 AM

YAMILV

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3 POSTS

What is the sytem fogged that your talking about to check for leaks.

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Monday, October 5th, 2009 AT 9:11 AM

JACOBANDNICKOLAS

MECHANIC
109,544 POSTS

What they actually fo is connect a machine up to the EVAP system and inject a fog into it. If there is a leak, the fog will come out there and then they can identify where it is coming from. Otherwise, you need to try to find it and they are very hard to locate.

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Monday, October 5th, 2009 AT 10:32 AM

YAMILV

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3 POSTS

Hello my question is when I turn my key on I cant hear the fuel pump like in other cars you could hear it. It tha wiil be the reason that woul not stard and shut off. Thanks you

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Tuesday, October 6th, 2009 AT 6:30 PM

JACOBANDNICKOLAS

MECHANIC
109,544 POSTS

Yes, the fuel pump can be bad causing this. Here is a how to for checking it:

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find. As far as the gauge needed, most parts stores will lend or rent the tool to you.