Losing Fuel Pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 9 (permalink) Old 02-05-2010, 07:47 PM Thread Starter
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Losing Fuel Pressure

I recently added a ITP regulated fuel system on my truck. When I was finished I set the fuel pressure at 65lbs. I noticed tonight it seem to have to crank a little longer to start, once it started I check the fuel pressure and it was at 40lbs. I adjusted the pressure back up to 65lbs, but the fuel pressure regulator is pretty bottomed out. So yesterday I went out and started the truck and the fuel pressure was 95lbs, I turned it back down to 65lbs and took the truck for a drive. I drove about 10 miles and checked the pressure, it was down to 50lbs. By the end of the drive (around 20 miles) the pressure had dropped to 40lbs. I'm starting to think that the fuel pump is getting weak, but the truck only has 55K on it. Anyone have any ideas?

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post #2 of 9 (permalink) Old 02-05-2010, 11:01 PM
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Re: Losing Fuel Pressure

Call ITP up and ask them. They will help you out.
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post #3 of 9 (permalink) Old 02-06-2010, 03:08 AM
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Re: Losing Fuel Pressure

Did you do any tank mods?

Sounds like a weak pump or the inlet screens are getting plugged.

After sitting sediment can fall off the screens, then when you drive for a while the fuel slosh can stir it back up and plug the screens again.

If you can I would "T" in a vacuum gauge into the pump inlet, and see what it reads when pressure drops. Should be no more that 2-4 in of vacuum.

Good Luck
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post #4 of 9 (permalink) Old 02-06-2010, 01:51 PM Thread Starter
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Re: Losing Fuel Pressure

Quote:
Originally Posted by Layson View Post
Call ITP up and ask them. They will help you out.
Dennis told me a few things to check and I checked those and everything looks to be just fine.

Terry

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post #5 of 9 (permalink) Old 02-06-2010, 02:06 PM
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Re: Losing Fuel Pressure

Is your fuel bowl drain valve leaking.

'03 7.3 lariat crew cab dually FX4
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DI 6 position
warn premium hub locks
4" mbrp straight piped exhaust
custom built trans w/ triple disc converter
'07 Front End w/ 6000k HID
AIH delete & CCV Mod
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post #6 of 9 (permalink) Old 02-06-2010, 11:12 PM Thread Starter
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Re: Losing Fuel Pressure

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Originally Posted by treyloco View Post
Is your fuel bowl drain valve leaking.
Nope, everything is bone dry. No spots in the garage, engine valley is nice and dry.

Terry

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post #7 of 9 (permalink) Old 02-06-2010, 11:30 PM
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Re: Losing Fuel Pressure

Quote:
Originally Posted by water_junky View Post
Nope, everything is bone dry. No spots in the garage, engine valley is nice and dry.

Terry
No reg return here, but I have a fuel psi guage inside the cab and over time watched to go from 60 to approx 45psi. Bought a new pump and it was still at 45psi. Pulled the tank and installed a new aftermarket fuel tank pickup and screen and got my 60 psi back. This is also supposed to help by providing fuel that is not as aerated as the OE pickup I can't remember where I got mine, maybe DieselSite.

2002 X PSD, Billy Boat 4", AirRaid, 38R,HO Outlet, IH Up-pipes, Gauges: Boost, EGT, Trans Temp, Fuel Pressure and Water Temp, Oil PSI at Turbo Pedestal

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post #8 of 9 (permalink) Old 02-07-2010, 05:50 AM
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Re: Losing Fuel Pressure

ITP has a 5/8ths pickup kit too.

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post #9 of 9 (permalink) Old 02-07-2010, 03:35 PM
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Re: Losing Fuel Pressure

Quote:
Originally Posted by chvyrkr81 View Post
ITP has a 5/8ths pickup kit too.
That's the one to get... been a while

2002 X PSD, Billy Boat 4", AirRaid, 38R,HO Outlet, IH Up-pipes, Gauges: Boost, EGT, Trans Temp, Fuel Pressure and Water Temp, Oil PSI at Turbo Pedestal

DP-Tuner 6 pos No Start - 140
Super Heavy Duty 4R100 / triple disc from ATO
Transmissions in Sacramento
ICON 5" Spring Pack Lift
PSC Ram Assist Steering




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