87 formula 305 carburated
Thread Starter
Junior Member
Joined: Aug 2006
Posts: 10
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From: Lakeside, California
Car: 1987 formula
Engine: 350
Transmission: 700r
Axle/Gears: 3.27
87 formula 305 carburated
Hi everyone. I am new here, but not to firebirds or camaro's. I have a 87 Formula with the 305 and quadrajet carb. Why is there a electric fuel pump and a mechanical one? The one in the tank is shot. Can I run just off the mechanical one? I would hate to have to cut my exhaust system just to get that da_n thing out! Any help would be greatly appreciated. Thanks for your time.
Charlie
Charlie
Junior Member
Joined: May 2006
Posts: 47
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Hi Charlie,
That's news to me, but I'm not 100% Camaro/Firebird oriented, since i have a 1987 El Camino SS, with the same CCC quadrajet. The Elky does not have an intake pump, relies completely on the mechanical one. So since your car has the same carb as mine it will run great on the mechanical pump, the in-tank pump may be more of a clog since it is not working. It may work better if you take out the in-tank electric pump and also add a Holley mechanical pump, which gives you better fuel flow than a 20 year old original stock pump.
Dave
That's news to me, but I'm not 100% Camaro/Firebird oriented, since i have a 1987 El Camino SS, with the same CCC quadrajet. The Elky does not have an intake pump, relies completely on the mechanical one. So since your car has the same carb as mine it will run great on the mechanical pump, the in-tank pump may be more of a clog since it is not working. It may work better if you take out the in-tank electric pump and also add a Holley mechanical pump, which gives you better fuel flow than a 20 year old original stock pump.
Dave
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Welcome aboard thirdgen.org.
It had the in-tank pump to help prevent vapor lock. If you try to let the mechanical pump suck through an inoperative in-tank electric pump, you are going to reduce the capacity of the mechanical pump, and greatly increase the tendancy for vapor lock.
If the in-tank pump has gone bad, the only real choices are to replace the pump, or remove it. You don't have to cut the exhaust to get the tank down, just drop it out of the way.
It had the in-tank pump to help prevent vapor lock. If you try to let the mechanical pump suck through an inoperative in-tank electric pump, you are going to reduce the capacity of the mechanical pump, and greatly increase the tendancy for vapor lock.
If the in-tank pump has gone bad, the only real choices are to replace the pump, or remove it. You don't have to cut the exhaust to get the tank down, just drop it out of the way.
Thread Starter
Junior Member
Joined: Aug 2006
Posts: 10
Likes: 0
From: Lakeside, California
Car: 1987 formula
Engine: 350
Transmission: 700r
Axle/Gears: 3.27
Welcome aboard thirdgen.org.
It had the in-tank pump to help prevent vapor lock. If you try to let the mechanical pump suck through an inoperative in-tank electric pump, you are going to reduce the capacity of the mechanical pump, and greatly increase the tendancy for vapor lock.
If the in-tank pump has gone bad, the only real choices are to replace the pump, or remove it. You don't have to cut the exhaust to get the tank down, just drop it out of the way.
It had the in-tank pump to help prevent vapor lock. If you try to let the mechanical pump suck through an inoperative in-tank electric pump, you are going to reduce the capacity of the mechanical pump, and greatly increase the tendancy for vapor lock.
If the in-tank pump has gone bad, the only real choices are to replace the pump, or remove it. You don't have to cut the exhaust to get the tank down, just drop it out of the way.
Charlie
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