Question about 1997 GMC Suburban

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1996 suburban, all ignition componants replaced. starts and runs rough, occasioanlyy shuts off going down the road. sometimes it will not restart after driving short distance , if i add 3-5 gals of gas from a can it will immedialty start back up, no matter how much fuel is in the tank. tank can be half full or more and still wont start unless adding some, fuel pump? thanks alot

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As you put in your question - Fuel pump? I would agree that this is the best place to start. Check the electrical supply when ignition is on. Listen to the pump when the ignition is switched to position 2 you should be able to hear it. If any doubt persists clamp off the fuel lines to and from the pump to isolate it, and then remove it. Just before doing so note its response when still connected to the electrical supply. Many faults with pumps can be solved by stripping it down and then cleaning components and electrical contacts with a tooth brush and emery board nail file. When reassembled try connecting the electrical supply and comparing its response to the way it behaved prior to strip down. Reconnect the fuel lines. If the problem persists check the pick-up pipe in the tank and the in-line fuel filter for possible blockages. Interesting observation that you had about the need to add a couple of gallons. I would bet that just releasing the fuel filler cap and refitting it would have the same effect as adding more gas. Within the fuel tank there is partial evaporation of gas and this can slightly pressurize the fuel line. When a small amount of gas is used a partial vacuum is caused preventing flow to the engine. Releasing the filler cap should allow the internal tank pressure to equalise with atmospheric pressure.

Posted on Apr 25, 2010

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