Mechanics

BLAZER STARTING PROBLEM

1991 Chevrolet Truck

Hi, I drive a 1991 Chevrolet Blazer 4.3L, 4X4, with 140000 kms on it and I was wondering if you can help me. I have to hold my key in the start position for at least 10 seconds And pump the gas pedal to get my truck started. The previous owner said that the fuel line is corroded and that it is leaking fuel. Do you know what the problem is?
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CavalierDriver65
March 14, 2007.



Are you really leaking fuel? If you were, it would be spewing out of the leak in a big smelly mess, and be real obvious. Most of the fuel line is easy to visually inspect. You can test the fuel pressure pretty easily. Purchase a fuel pressure gauge at a supply shop, figure $25-$40 bucks. Make sure it has a push button bleed off valve and drain hose to release pressure. That MUST drain into an approved gasoline container! The gauge will attach to what's called a Schrader Valve, located on top of the engine, at the rear of the intake manifold, drivers side by the firewall on the high pressure fuel line. The Schrader should have a twist off cap, and is very similar to an over-size tire air valve. Screw the gauge hose onto the valve. You will get some fuel spill as you connect and disconnect the gauge. Once it's secure, turn the key to on but don't start, and listen for the fuel pump to run for 2 seconds. It should build 60 PSI and hold. Start the truck and measure the flow when running, at idle it should be 55-60 PSI. Rev the engine and it should momentarily jump to over 60 PSI. Any readings other than that requires more testing to isolate the problem.

Tiny
M1Garand
Mar 19, 2007.