Walbro Fuel Pump Question
#1
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Car: 1991 Firebird Vert
Engine: 383 L98/LT-1
Transmission: 700R4
Axle/Gears: 3.73
Walbro Fuel Pump Question
I have a 91 Firebird, but the motor in it isn't the stock one and I have no idea what year, plus I had a converted LT1 intake put on. I know it was a 255 Walbro. A couple weekends ago it wouldn't start anymore, I'm assuming my fuel pump went out, hooked up a gauge to the valve on the rails and it read 0 pressure. My question, if I order another 255 Walbro, will it be a direct swap? I don't want to drop the tank, look at the part number, order it and wait, I'd like to order it now and install it ASA it comes in.
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Car: 91/Z28/69SSCamaro/72Cheyenne
Engine: 350/350/350
Transmission: 700r4/400/350
Axle/Gears: 3.23/4.56/4.11
Re: Walbro Fuel Pump Question
I have a 91 Firebird, but the motor in it isn't the stock one and I have no idea what year, plus I had a converted LT1 intake put on. I know it was a 255 Walbro. A couple weekends ago it wouldn't start anymore, I'm assuming my fuel pump went out, hooked up a gauge to the valve on the rails and it read 0 pressure. My question, if I order another 255 Walbro, will it be a direct swap? I don't want to drop the tank, look at the part number, order it and wait, I'd like to order it now and install it ASA it comes in.
It will work just fine BUT have you checked the fuel pump relay ? Can you hear the pump at all ? Does it have power going to it ?
I put a BBK in mine and all I had to do was adjust some wires going it.
Last edited by Tx 91Z28; 06-18-2013 at 02:41 PM. Reason: poor typing lol
#3
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Car: 1991 Firebird Vert
Engine: 383 L98/LT-1
Transmission: 700R4
Axle/Gears: 3.73
Re: Walbro Fuel Pump Question
Yes, the pump will kick on, and there is fuel up at the shrader valve when I press the nipple.
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Walbro Fuel Pump Question
How did you decide fuel was the problem?
Did you check for both spark and fuel?
Pump only runs for 2 sec when key turned on then it turns off.
You need to jumper the pump relay so the pump runs full time BEFORE doing any pressure tests.
Did you check for both spark and fuel?
You need to jumper the pump relay so the pump runs full time BEFORE doing any pressure tests.
#7
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Car: 1991 Firebird Vert
Engine: 383 L98/LT-1
Transmission: 700R4
Axle/Gears: 3.73
Re: Walbro Fuel Pump Question
OK, I'm stupid, how do you do that?
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Car: 91/Z28/69SSCamaro/72Cheyenne
Engine: 350/350/350
Transmission: 700r4/400/350
Axle/Gears: 3.23/4.56/4.11
Re: Walbro Fuel Pump Question
1st off your not stupid, stop putting yourself down. Everyone had to start somewhere. Vettoz will be along later and explain it. BUT meanwhile find the fuel pump relay and unplug it. Check which wire has voltage coming in and jump it to the wire going out thusly bypassing the relay, I don't know the exact wires but that is the theory. This wil llet fuel pump run while you do pressure test. One of the supreme boys will be along shortly!
#9
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Car: 1991 Firebird Vert
Engine: 383 L98/LT-1
Transmission: 700R4
Axle/Gears: 3.73
Re: Walbro Fuel Pump Question
OK, so I replaced the fuel pump and put gas in the tank and it starts up like a dream. I hooked up a FP gauge and when the key is turned, the pressure shoots up to like 80PSI then when started, it goes up to 100PSI and stays there.
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