checking a fuel pump on a 93 vette
Thread Starter
1st Gear
Joined: Mar 2014
Posts: 1
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checking a fuel pump on a 93 vette
Is there a way of testing a fuel pump at the connection of the fuel tank? I think there are only three wires going in. I assume one is ground , and one is for the sending unit, but which one is which? I was hoping to be able to put 12v to the wire and know if the pump was junk.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Disconnect the harness connector and using a test light...when you turn on the key...the power going to the pump will be on for about 2 seconds and then go off as designed.
Black is ground...I believe tan is sending unit and the other should be power. I do not have my manual here at home ...but if my memory serves me correctly...that is how it is.
Now would be a good time buying a factory service manual. No Chilton, Haynes or Mitchell books...only the manual from Helm.
DUB
Black is ground...I believe tan is sending unit and the other should be power. I do not have my manual here at home ...but if my memory serves me correctly...that is how it is.
Now would be a good time buying a factory service manual. No Chilton, Haynes or Mitchell books...only the manual from Helm.
DUB
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
From my 94 FSM and other documentation in have;
Gray is pump power, purple is sending unit.
But in a post I wrote long ago, I indicated the sending was a green wire. Thinks that's because it really was green and I did not know why it was different from the FSM.
Hope this helps.
Gray is pump power, purple is sending unit.
But in a post I wrote long ago, I indicated the sending was a green wire. Thinks that's because it really was green and I did not know why it was different from the FSM.
Hope this helps.
Pro
Joined: May 2008
Posts: 670
Likes: 56
Open the fuel filler door and remove the rubber boot. The fuel line at the top of the tank (toward the front of the car) is the fuel supply line to the engine, disconnect it and attach a short length of fuel line running to the ground and into a bottle. Turn on the key and go back behind the car to see if any fuel ran into the bottle, if not then your fuel pump is shot or a fuse is out, but probably the pump is bad.
