Engine swap/change and lost fuel pressure? - Mustang Evolution

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Old 12-31-2014, 04:58 PM   #1
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Engine swap/change and lost fuel pressure?

So I got my new 4.6 in my 1999 GT 5 speed. I have spark and it runs on starting fluid, but I don't have fuel pressure. What part on the wiring harness controls that? I probably missed something
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Old 12-31-2014, 05:41 PM   #2
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I would trace the wires from the fuel pump and see where its not getting power. I had this happen to me, and it was the neutral safety switch in the trunk.
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Old 12-31-2014, 05:43 PM   #3
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....And make sure your fuel pressure regulator is plugged in
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Old 12-31-2014, 06:57 PM   #4
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Quote:
Originally Posted by Roguestang View Post
....And make sure your fuel pressure regulator is plugged in
where is that located? Also, I got it to fire more than a few times. I have to crank it for like 5 seconds and then it fires up and runs at 1800 rpm for like 5-10 seconds and then stops running all at once.
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Old 12-31-2014, 07:04 PM   #5
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it starts up around the second crank of the engine if I cycle the key a bunch of times to prime the fuel system. But its really not building much fuel pressure at all. Can I just hard wire my fuel pump and put switch to it on my dash board? Which wires are power and ground to the fuel pump? do I have to drop the tank?


If there is an electrical problem, I am going to bypass it with my own simple, reliable, and free solution.
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Old 12-31-2014, 07:09 PM   #6
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It's on the fuel rail there's only one plug that goes in to it. But if it does start, then it's probably a faulty pump. Sounds like it's not holding the pressure. Check to see if the pump is getting the correct voltage. If it is, then you'll most likely need a new pump. They aren't hard to change either...
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Old 12-31-2014, 07:11 PM   #7
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OKay that makes sense. Oh and I noticed that when I parked the car a week ago after driving it into my garage, it had fuel pressure. then I started working on it last night and it no longer had fuel pressure. is that also abnormal?
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Old 12-31-2014, 07:31 PM   #8
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Yes it is. Got to be your pump.
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Old 12-31-2014, 07:44 PM   #9
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Okay, ive had two seperate fords fuel pump fail within a week of starting work on them lol. One was a 2002 crown vic and the other was my 01 roush. It sounds like your having the same issue. Replacing the pump is pretty straight forward. The v6 has a solid filler neck so it was a pain to drop the tank lol.

one day i hope to have something pretty damn witty here
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Old 12-31-2014, 09:25 PM   #10
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There is nothing on my fuel rail that I can see that is a plug. Is it on the bottom of the rail or what? Is it just near the rail and not actually on it?
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Old 12-31-2014, 10:16 PM   #11
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It's on the drivers side fuel rail. Can't miss it. But I wouldn't even worry, it's gotta be your pump. Probably has a bad seal, and isn't holding pressure.
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Old 12-31-2014, 10:24 PM   #12
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oh yeah I know that now that I see a pic of it. I have that right for sure. I just didn't know that that is what it was called in particular. Its kind of crazy that I replaced my own engine to be honest. I don't know **** haha
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Old 12-31-2014, 10:31 PM   #13
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Hey you gotta learn somehow
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Old 12-31-2014, 10:39 PM   #14
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Exactly ^ Plus its not like anybody else was going to change my engine for me. Im gonna be proud once all of this fine tuning is done anyways. I might just say F*ck it and put my carb on just so I don't have to deal with the finicky efi system. I can tune carbs really well from racing motocross and dealing with power boats and I honestly enjoy wrenching on my car so adjusting it will not bother me a damn bit.
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