I was today preparing to start my '91 for the first time in 11 years. I wanted to make sure that the fuel lines do not leak when pressurized. So, I connected my new battery but had problem getting the negative bolt to thread in. While I was struggling with it I saw a spark in the connection block behind the battery. I didn't really register it at the time. The battery bolt was bad so I had to go get a new one and while doing that I forgot the spark incident. The new bolt threaded in just fine and I got power on but no buzz from the fuel pump. Tried it many times, car cranks but nothing from the pump.

I connected my fuel pressure gauge and it shows nothing. I tested and cleaned the 10A fuse in the fuse panel and it is fine. I also connected my scanner and no error codes. It shows 0 volts to the fuel pump, but I do not know if there should be any voltage when the car is not running or priming the rail?

I didn't have more time to further diagnose it as I needed to get it back to its wheels. I have a tow truck coming tomorrow to pick it up.

Later on when I was driving home I remembered that spark. Is there a fusible link in that connection block that is directly responsible in providing voltage to the fuel pump? Did I possibly fry one while trying to connect the new battery?

Any other possibilities? The Racetronix fuel pump is "new". I installed it 11 years ago and drove the car on the trailer and from the trailer to the garage its now at.

I appreciate any tips. Thanks!

 

The first thing I would do would be to apply power directly to the fuel pump. I believe the fuel pump relay (under the pass side dash) and the fuse are the only "stops" in the fuel pump circuit. I could be wrong though. I did find this: https://www.corvetteforum.com/forums...post1596079226 which may be helpful to you.

 

If you have the FSM you can check the ALDL. My 87's ALDL can have 12vdc applied to pin G and power the fuel pump. I am sorry but I do not have a 91 FSM.

 

Yes, I do have one but after a long time of not looking at it I now find frustrating to try to find anything in it. The logic where stuff is hidden in it doesn't open to me. But, I'll have to sit down and try to figure it out.

Pin G and fuel pump sound familiar though. I'll have a look.

The car was today flat bedded to my house and tomorrow I still have to move all my other stuff from the old garage but in few days I should have more time to figure it out. All suggestions on how to diagnose the problem are highly appreciated.

 

Yes, I do have one but after a long time of not looking at it I now find frustrating to try to find anything in it. The logic where stuff is hidden in it doesn't open to me. But, I'll have to sit down and try to figure it out.

Pin G and fuel pump sound familiar though. I'll have a look.

The car was today flat bedded to my house and tomorrow I still have to move all my other stuff from the old garage but in few days I should have more time to figure it out. All suggestions on how to diagnose the problem are highly appreciated.

 

I have an electronic copy that's a little easier to search through. Here's the pinout for a '91.

I went to section 8D but there is no mention of the fuel pump. You may just have to power it at the connector under the fuel door.