Question about 1998 GMC Sierra

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My GMC pickup will only start with starting fluid. After it starts, the engine runs fine. It seems like the carb is getting no gas until the starting fluid starts the engine.

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Check your fuel pressure at the shredder valve, there should be 60 to 65 psi when the fuel system is primed. "engine not running" once the engine is started the fuel pressure should drop around 5 psi, any other readings will give you a no start or no run. Your fuel filter may be close to the end of it's life or the fuel pump may not be pushing enough pressure when the battery is under load and under 12 volts, once the engine start's the voltage rises to 13.5 volts giving the fuel pump that extra to keep the fuel pressure up. The other common problem to your Vortec engine is the fuel system. The fuel pressure regulator is know to go bad on the Spider system, which also would give you the no start problem. Start simple with replacing the fuel filter and check the fuel pressure at the shredder valve and then go from there. Keep me posted, be glad to help you get your truck running 100% again. 

Posted on Sep 04, 2009

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  • GMC Master
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Are you one of those people who TOP OFF the tank when filling up?

When the EVAP recovery system soak with few ounce of gasoline......the trap vapor will take few days escape.

EVAP system is design to handle fuel vapor. Few ounce of gasoline can damage the fuel vapor recovery relay and decrease the service live of the recovery lines.

=========

You can accelerate the process by locating the charcoal canister (near the nose of the car and same side as your gas filler door)

MOVE the car to outdoor.

Disconnect the EVAP line and let it air out by itself.

DO NOT introduce any heat source or fan to speed up the process.

Reconnect this EVAP hose and use a small amount of starting fluid at the intake manifold.


Please post more information by Clicking on the comment link.

I will follow up.

Posted on Dec 03, 2009

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This year and 1999 has a serious fault with the fuel pump and the fuel pump connector at the tank getting burnt, replace the fuel pump module and the fuel pump connector and the problem will go away, just fixed this exact same problem on a family members GMC

Posted on Sep 04, 2009

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Posted on Jan 02, 2017

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