Anyone ever hear of 2 fuel pumps on a carbed motor? I have a mechanical one on the motor and I just dropped the tank yesterday and found the fuel sending unit has an electric pump attched to it also. Sending Unit(FEH) is original and has 3 wires in the harness.I was told previously that a carbed motor wouldnt have an electric pump in the tank and bought a used sending unit based on that information. WTF?

 

Yes, GM added a pusher pump in the gas tank to help with vapor lock mainly on HO engines. Some 83's and 84's could have them added by the dealer and I think later years got them from the factory.

 

Thanks for the reply. I guess I will be sending the original one out to be refurbished. I have to buy a new tank also. I tried forcing air into the tank to reform it but it didnt work as well as I thought it would. It's a little confusing because the tank made for an in tank fuel pump has a larger opening for the sending unit than one w/o the tank unit. The used sending unit I bought from a thirdgen member does not have the fuel pump on it but still fits on the old tank. See the pics.

 

Got an electric one in the tank in my 1987 LG4.

 

Pics of the used one I bought.

 

My 85 IROC w/TPI had it in the tank also, but it did not have a mechanical one on the motor. I was suprised to find the L69 had both pumps.

 

I'm confused about what you're saying here. I don't have a particularly large personal database, but I was of the understanding that all 3rd gen tanks have the same size opening.

That would be consistent with my understanding.

FWIW, I've got a used tank in great condition (California) car available. It is a non-electric-pump version, but as you observed, the pick-up with the pump should fit in it.

 

Thanks 57, but I think I found a tank. While I was shopping for a tank I was consistantly asked if the car was carbed or FI. When I asked what the difference was I was told the FI sending unit pump would not fit into the hole on a tank made for a sending unit w/o a pump. I have not seen another tank other than the one I pulled from my car, and I wanted to avoid ordering the wrong tank. You could be correct that all the tanks have the same size opening. I just want to avoid getting the wrong one if thats not the case.