Carb'd L69 to Holley Double Pumper, In Tank Fuel Pump
08-06-2013, 09:25 AM
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Car: 1984 Trans Am
Engine: 355
Transmission: T-56
Axle/Gears: 10 Bolt, Torsen Diff, 3.73's
Carb'd L69 to Holley Double Pumper, In Tank Fuel Pump
Hey guys, so like the title says I have a CCC L69 305 engine that's going to become a 350 with a Holley Double Pumper. Question is, what do I do with the in tank fuel pump? I'm ditching the ECM, but I'm not sure if the ECM controls the fuel pump, or if I can leave it. The new motor will also have a mechanical pump on the block.
Not too sure if I'm in the right spot, I'll probably post this in engine swap as well.
Not too sure if I'm in the right spot, I'll probably post this in engine swap as well.
08-06-2013, 03:55 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I can't come up with any diagrams at the moment, but if I recall correctly, the electric pump is turned on initially by a timed relay that primes the system, then by an oil pressure switch to keep the pump on when the engine is running. So, shouldn't be a problem going to a non-computer system.
08-06-2013, 04:12 PM
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Car: 1984 Trans Am
Engine: 355
Transmission: T-56
Axle/Gears: 10 Bolt, Torsen Diff, 3.73's
Re: Carb'd L69 to Holley Double Pumper, In Tank Fuel Pump
This is the general consensus from everything I've heard. The main reason I was wondering was because I'm doing a rear end swap this weekend, and I figured if I had the rear end out it would make sense to do this in one fell swoop.
But, I think I'm going to go with everyone else and hope I don't have to. Not like pulling the rear is difficult if I have to again.
But, I think I'm going to go with everyone else and hope I don't have to. Not like pulling the rear is difficult if I have to again.
08-07-2013, 07:02 AM
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Car: 86 T/A - 70 Z28/RS
Engine: Broke - 350
Transmission: 700R4 - M22
Axle/Gears: G80, 2.73 - ZQ9 G80 4.10
Re: Carb'd L69 to Holley Double Pumper, In Tank Fuel Pump
Well you don't have to pull the rear end out to drop the tank. The hardest part is just breaking the bolts free for the first time on the rear. 
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