fuel pressure trouble is it the cold?? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 12-15-2010, 04:28 AM Thread Starter
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Unhappy fuel pressure trouble is it the cold??

fuel pressure keeps going down

Sorry for posting twice just trying to see if anyone has had this problem or knows why it is doing this.

my pressure was 52p @ idle and 43p @ wot so I changed my regulator spring to the longer blue one. Someone had done the bb mod so O took that out and put in the new spring and had the same pressure 52p and 43p so I put the bb back in with the new spring and was at 70p @ idle and 65p @ WOT just where I wanted it. Now every day it has come down a little at a time. The day after the mod it was at 68p @ idle the next day 65p @ idle and 58p @ WOT now today it is at 62-63p @ idle and 56-58p WOT WHAT GIVES!! I have no leaks. The fuel pump was replaced 2yr ago and also has a summit raceing pusher pump to give extra pressure and all works. Any help please. The only change is the weather has gotten colder.


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2004 F250 4x4
1) head studs
2) 4" turbo back exhaust MBRP muffler
3) super expensive built transmission
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4) leveling kit and 3.73 gears with a locker
5) Full EGR delete
6) Air Dog 2 165
7) full set of gauges
8) ladder bars
9) smoke switch (I Don't use it)
10) eliminated banjo bolts for 90 degree fittings
11) tuned by lots of people
12) ported heads
13) 190/75%
14)Powermax turbo
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post #2 of 12 Old 12-15-2010, 04:41 AM
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For me the cold weather makes my fuel pressure go up..I don't have the BBC mod or anything just a airdogII with my pressure set at 64 idle and 58 wot..but since this cold weather its 70-72 idle and 62-64 wot..don't have an answer for you but the cold deff has something to to do with it lol

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post #3 of 12 Old 12-15-2010, 05:28 AM Thread Starter
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Well then that sux even more because mine is going down. It seems to have settled at 62p idle and 56-58p at WOT I want it back at 70p at idle. I may have to buy a external fuel regulator and set it my self.


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2004 F250 4x4
1) head studs
2) 4" turbo back exhaust MBRP muffler
3) super expensive built transmission
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

4) leveling kit and 3.73 gears with a locker
5) Full EGR delete
6) Air Dog 2 165
7) full set of gauges
8) ladder bars
9) smoke switch (I Don't use it)
10) eliminated banjo bolts for 90 degree fittings
11) tuned by lots of people
12) ported heads
13) 190/75%
14)Powermax turbo
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post #4 of 12 Old 12-15-2010, 05:52 AM
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Well atleast its not dropping below 45.. and why do you want it at 70? I believe I've read it been told by a diesel tech that over 70 psi can blow the injector o rings? Don't know if its true or not tho

2004 F-250 5.9
97 12 valve P-pump tuned,4k and worked!
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post #5 of 12 Old 12-15-2010, 05:57 AM Thread Starter
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yah anything above 70p cam blow injector o-rings. I just like to no It is the best it can get. Its just me


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2004 F250 4x4
1) head studs
2) 4" turbo back exhaust MBRP muffler
3) super expensive built transmission
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

4) leveling kit and 3.73 gears with a locker
5) Full EGR delete
6) Air Dog 2 165
7) full set of gauges
8) ladder bars
9) smoke switch (I Don't use it)
10) eliminated banjo bolts for 90 degree fittings
11) tuned by lots of people
12) ported heads
13) 190/75%
14)Powermax turbo
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post #6 of 12 Old 12-15-2010, 08:20 AM
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Leave it where it is. That's perfect.

Blake

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post #7 of 12 Old 12-15-2010, 08:29 AM Thread Starter
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I will leave it for now. I just could not figure out why it was dropping.


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2004 F250 4x4
1) head studs
2) 4" turbo back exhaust MBRP muffler
3) super expensive built transmission
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

4) leveling kit and 3.73 gears with a locker
5) Full EGR delete
6) Air Dog 2 165
7) full set of gauges
8) ladder bars
9) smoke switch (I Don't use it)
10) eliminated banjo bolts for 90 degree fittings
11) tuned by lots of people
12) ported heads
13) 190/75%
14)Powermax turbo
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post #8 of 12 Old 12-15-2010, 08:56 AM
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If it drops anymore, I'd be concerned. But it shouldn't. It's probably just settling to where your fuel pump likes it best.

Blake

2013 F-150 CCSB Oxford White FX4 EcoBoost
Loaded with every option...

2008 F-250 CCSB Dark Copper King Ranch 6.4L FX4
4" MBRP Exhaust w/ Muffler (DPF/DOC Delete), Modded Stock Intake, H&S XRT Pro
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post #9 of 12 Old 12-15-2010, 12:03 PM Thread Starter
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I guess so . You would think it would be high with the new longer spring and a BB.


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2004 F250 4x4
1) head studs
2) 4" turbo back exhaust MBRP muffler
3) super expensive built transmission
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

4) leveling kit and 3.73 gears with a locker
5) Full EGR delete
6) Air Dog 2 165
7) full set of gauges
8) ladder bars
9) smoke switch (I Don't use it)
10) eliminated banjo bolts for 90 degree fittings
11) tuned by lots of people
12) ported heads
13) 190/75%
14)Powermax turbo
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post #10 of 12 Old 12-15-2010, 12:50 PM
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