Question about 1994 Chevrolet Camaro
If the outside temperature is around 40 degrees I have to turn the engine several times before it will start. Once engine is warmed up it cranks fine. Have replaced fuel pump relay, throttle position sensor, fuel filter, and fuel pressure regulator. However I have noticed that the fuel pump is not engaging when I turn on the key.
When I replaced the fuel filter it engaged for a little while.
While I had the regulator off I turned on the key and the fuel pump engaged then.
You have one of 2 things going on here, but 1st let me explain how the fuel pump gets power from the ignition switch, when you crank the engine the pump receives power from the crank contacts of the ignition switch, once the engine starts the power comes from the run contacts of the ignition switch, so you may have an issue with the cranking contacts of the ignition switch, the other more common problem is that the check valve in the fuel pump is defective, this lets all the fuel drain back to the fuel tank when the pump is off, when you go to crank the pump has to pump the filter and the lines full and the air has to bleed out the injectors, what does this mean? long crank times and hard start, this problem is made worse by cold weather because n engine requires a richer mixture (more fuel) to start cold. One note if u turn the ignition to run but don't start the engine the pump will only run a few seconds then the computer will shut it off.
Posted on Dec 09, 2008
So pump does not always come on when you turn key on? possible relay sticking at cooler temps. possible check valve bad in pump allowing fuel to drain back out of lines. need to install pressure gauge and see what is going on. if fuel drops to zero when key cuts off it is check valve.
Posted on Dec 09, 2008
First thing, if you haven't changed it in a while, change the fuel filter. Don't let the gas go below 1/4 tank or all the debris in the tank clogs your injectors.
If that doesn't help you will have to hook up a fuel psi guage to the car and see what kind of fuel psi you have..............
Posted on Dec 08, 2008
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