fuel pressure problems help!! - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 18 (permalink) Old 07-14-2013, 08:26 PM Thread Starter
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fuel pressure problems help!!

Just installed my swamp injectors and frx in my truck, was losing fuel pressure, so I put a new fuel pump in and dropped the tank and my pickup was pretty clean. And now have no idea why I keep losing pressure, it's fine when it first starts up but after I drive a few miles and try to get in it. It just drops to 0 and dies on me, anybody have any ideas?

Late model 99 ext cab - Exterior: 05 front end, 08 mirrors, 08 tail gate, 10 inch skyjacker lift on full springs, 22x13.50 moto metal 962's wrapped in 37" Toto mt's.
Engine: swamps 160/100 sticks, turbonetics turbo with a 63/91 comp wheel, gauges, riffraff ocr, riffraff intercooler boots, ts 6 pos chip.
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post #2 of 18 (permalink) Old 07-14-2013, 08:52 PM
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Re: fuel pressure problems help!!

try a real regulated return....

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post #3 of 18 (permalink) Old 07-14-2013, 09:14 PM Thread Starter
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Re: fuel pressure problems help!!

I don't feel like that's the problem, plenty of guys are running just an frx and don't seem to be having the same problem.

Late model 99 ext cab - Exterior: 05 front end, 08 mirrors, 08 tail gate, 10 inch skyjacker lift on full springs, 22x13.50 moto metal 962's wrapped in 37" Toto mt's.
Engine: swamps 160/100 sticks, turbonetics turbo with a 63/91 comp wheel, gauges, riffraff ocr, riffraff intercooler boots, ts 6 pos chip.
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post #4 of 18 (permalink) Old 07-14-2013, 09:26 PM
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Re: fuel pressure problems help!!

Have you checked the fuel lines where they hook into the cylinder heads for leaks. You are supposed to replace those sleeves every so often because the can cause good leaks.

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post #5 of 18 (permalink) Old 07-14-2013, 10:10 PM
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Re: fuel pressure problems help!!

If the sleeves are leaking, they will create an external leak.

You need to start by finding out what the pressure is right at the pump. If you have 0 psi at the pump after some time, you need to remove the pickup, and put a line from a bucket of fuel to the pump. Then retest.

Report back after doing this...

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post #6 of 18 (permalink) Old 07-14-2013, 11:39 PM
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Re: fuel pressure problems help!!

Yeah you need to find out what you have at the pump and if its not enough you need to put a restriction gauge on the inlet side of pump if you can get one. Any more than 6Hg at WOT and you have a restriction. Did you look at just the screen on the pick up? If so you probably did no see a restriction as it would be on the socks of the inside of the pickup. If you take some small screw drivers or picks you can wedge them in the seam at the bottom of the housing and it will come out with a little finess. Then just take some brake clean and spray them off and reinstall. Just be careful not to break housing when coming apart

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post #7 of 18 (permalink) Old 07-15-2013, 06:50 PM Thread Starter
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Re: fuel pressure problems help!!

Well after I checked everything in my tank I put everything back together and also checked my spring and made sure I was getting fuel into my bowl.. after everything was back in I started it up and all of a sudden had 90 psi of fuel pressure drove it around the block dropped to about 80 psi and just cut off randomly..

Late model 99 ext cab - Exterior: 05 front end, 08 mirrors, 08 tail gate, 10 inch skyjacker lift on full springs, 22x13.50 moto metal 962's wrapped in 37" Toto mt's.
Engine: swamps 160/100 sticks, turbonetics turbo with a 63/91 comp wheel, gauges, riffraff ocr, riffraff intercooler boots, ts 6 pos chip.
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post #8 of 18 (permalink) Old 07-15-2013, 09:53 PM
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Re: fuel pressure problems help!!

90 psi or even 80 psi fuel pressure will do some serious damage to those injectors. If you are running a Walbro fuel pump, you cannot run a FRx kit because the springs will not work. Stock fuel pump with that kind of fuel pressure, then your spring in the FRx kit is in a bind probably. I had a FRx kit and went to a regulated return.

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post #9 of 18 (permalink) Old 07-16-2013, 04:25 PM Thread Starter
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Re: fuel pressure problems help!!

That's what I was affraid of.. ya I was using a stock fuel pump... So did you have any problems with the frx?

Late model 99 ext cab - Exterior: 05 front end, 08 mirrors, 08 tail gate, 10 inch skyjacker lift on full springs, 22x13.50 moto metal 962's wrapped in 37" Toto mt's.
Engine: swamps 160/100 sticks, turbonetics turbo with a 63/91 comp wheel, gauges, riffraff ocr, riffraff intercooler boots, ts 6 pos chip.
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post #10 of 18 (permalink) Old 07-16-2013, 06:32 PM
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Re: fuel pressure problems help!!

what color spring did you use in the frx..they had one that will go that high.

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