Low fuel Pressure help?? - Ford Powerstroke Diesel Forum

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post #1 of 15 Old 02-24-2013, 06:51 AM Thread Starter
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Low fuel Pressure help??

I haven't noticed any running issues but my fuel pressure is a lot lower than every one recomends especially with my stage I's. I have done some reading on here and I have just confused my self. I tried the BB behind the spring (not sure if that is for our superdutys or the OBS) and just priming the pump brought it up to about 80 to 90 psi and blew out the filter o ring gasket so i took that back out. Do I need to get this blue spring I hear about? Its my E99 with a factory fuel pump and at idle I have 60 psi. Normal driving with moderate hills it holds 50 to 55psi and at WOT it will drop down to 40 to 45 psi. What do you all think? Thanks!

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post #2 of 15 Old 02-24-2013, 07:05 AM
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70 bucks is a heck of a lot cheaper than injectors. just my .02


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post #3 of 15 Old 02-24-2013, 07:08 AM
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or keep the BB in the FPR, and cut the spring..1/2 coil atta time ,til you achieve the psi you want.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #4 of 15 Old 02-24-2013, 07:09 AM Thread Starter
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I missed something,what's 70 bucks? I obviously don't want to mess up my injectors.

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post #5 of 15 Old 02-24-2013, 07:31 AM
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Originally Posted by timmyboy76 View Post
or keep the BB in the FPR, and cut the spring..1/2 coil atta time ,til you achieve the psi you want.
we posted at same time..think the 70 buks is for a new FPR assy. Too high of f/p, will blow out the injector orings.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #6 of 15 Old 02-24-2013, 09:42 AM Thread Starter
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Think I will just order the blue spring everyone talks about and see what that brings it up to. Thanks.

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post #7 of 15 Old 02-24-2013, 11:00 AM Thread Starter
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Any one know the part number for this blue spring kit for my 7.3? All I can find is the kit for the 6.0's.

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post #8 of 15 Old 02-24-2013, 11:06 AM
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looks like, if someone wants to forfeit up a spring since they have the kit, otherwise, your only option is this route...

Riffraff Diesel: Fuel Rail Crossover™

FWIW, i have a BB in the fpr, and holds 70psi, 68 at wot, has about 2 full coils cut off too.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #9 of 15 Old 02-24-2013, 11:20 AM Thread Starter
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Oh I see now. We DO use the 6.0 spring on our 7.3 and I guess just throw the other pieces on a shelf some where. Well I think I will try what you did with the bb first and if i mess it up I will just order the blue spring kit. Thanks again for the help. I will post back with my results afterwards.

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post #10 of 15 Old 02-24-2013, 11:23 AM
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when doing so, with the "high" marks on the plunger, i wet-sanded them, 1000grit, to make smooth again...ya, its a pain, but after a few install/removals,...it becomes a quick tweeking of fpr. Just cut 1/2 coil atta time.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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