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Old Jul 13, 2007 | 11:04 AM
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Stalling 302

I finally got around to finishing the carb swap and cam install on my 89 f150 today. I started it and it ran fine but stalled after about 10-15 seconds of running. After it stalls it will start up again and do the same thing. The motor has an edelbrock performer intake, carb and cam and an hei distributor if this helps. Any help would be appreiciated.
 
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Old Jul 13, 2007 | 11:38 AM
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are you running a mechanical fuel pump or still running off the electric pump in the tank? have you installed an adjustable fuel pressure regulator?
 
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Old Jul 13, 2007 | 11:45 AM
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It is running off the electric pump and I am using a mallory return style regulator
 
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Old Jul 13, 2007 | 12:20 PM
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what psi do you have the regulator set to?
 
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Old Jul 15, 2007 | 07:52 AM
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Is it losing spark or is it a fuel problem?
 
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Old Jul 16, 2007 | 11:19 AM
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I have the regulator cranked all the way up and I can only get 6-7 psi out of it. It will run, but after about 20 seconds the fuel pressure will drop to close to zero and it will stall. I dont have much fuel in the tank, could this have something to do with it?
 
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Old Jul 16, 2007 | 03:50 PM
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needs fuel to run....hello...

replace the filter

pull the line off the carb and turn on the pump..see how much fuel you get out of it..let it run for a while see what happens...sounds like a clogged filter to me....but who knows it could be out of gas.........
 
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Old Jul 16, 2007 | 05:30 PM
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I replaced the filter and filled up the tank and still no go. I pulled the line off the carb and right when you turn the key, a fair amount of fuel comes out but just for about half a second.
 
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Old Jul 16, 2007 | 05:47 PM
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What is turning on the fuel pump?
Does the pump run all the time or just for a few seconds after you turn the key?
 
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Old Jul 16, 2007 | 06:04 PM
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I have a switch to turn on the fuel pump and the pump only runs for a few seconds when I turn the key and flip the switch.
 
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Old Jul 16, 2007 | 06:26 PM
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Originally Posted by 302 F-150
I have a switch to turn on the fuel pump and the pump only runs for a few seconds when I turn the key and flip the switch.

So it runs all the time after you flip the switch?
 
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Old Jul 16, 2007 | 06:31 PM
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sounds like the pump needs a direct connection............or feed the fuel pump relay some power off the ignition, so when the key is on the relay is on feeding the pump power all the time....by-pass the computer that keeps turning it off.
 
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Old Jul 16, 2007 | 06:56 PM
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So just unhook the two wires on the fuel pump and wire it as I would wire an aftermarket electric fuel pump with a switch and that should do it?
 
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Old Jul 16, 2007 | 07:39 PM
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I guess.....but you are better off using the relay thats all ready there....just feed that power or a ground which ever the PCM uses to turn on the pump.....
 
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Old Jul 16, 2007 | 07:41 PM
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it's easyer than it sounds......
 
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