dropping fuel pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 16 (permalink) Old 09-16-2009, 01:22 AM Thread Starter
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dropping fuel pressure

I just installed my 320/200 injectors and my airdog II and DI intank kit. when the fuel level is at 1/4 tank or below when i get into it (even in my tow/eco setting) fuel pressure is dropping. It never did this before. is this because of the very large injectors and demand for fuel the airdog is trying to supply it with or is it that i did somthing wrong when installing the intank kit?

I used DI's kit and went and bought a union and some brake line and made me a return like itp does to move fuel far away from pickup. the only part of the directions i didnt foillow was putting the screen back on the pickup, the truck is and 03 and been ran outa fuel atleast 3 times since i owned it and the screen was crystal clear, so if it hasnt gotten dirty by now it wont.

Thanks for yalls imput

2009 F-250 ccsb black/black

Lowered 4400lb spring, 20x10 MM962, Nitto 420, traction bars, 5" exhaust 7" MBRP black stack, SCT - Innovative tunes, IDP cold side IC pipe, MPD trans. Blacked outtttt
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post #2 of 16 (permalink) Old 09-16-2009, 01:31 AM
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Re: dropping fuel pressure

Sounds like the pickup is being uncovered.
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post #3 of 16 (permalink) Old 09-16-2009, 01:33 AM
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Re: dropping fuel pressure

Fill your tank up doosh... I try to keep mine over a quarter or the fuel pressure gauge wobbles

Stock
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post #4 of 16 (permalink) Old 09-16-2009, 01:37 AM Thread Starter
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Re: dropping fuel pressure

I Know that krissss, i keep it above 1/2 at all times now.

I was just curious if maybe i installed the pickup wrong, or if accelerating "hard" was uncovering the pickup like matt said. which i am hoping thats the case.

2009 F-250 ccsb black/black

Lowered 4400lb spring, 20x10 MM962, Nitto 420, traction bars, 5" exhaust 7" MBRP black stack, SCT - Innovative tunes, IDP cold side IC pipe, MPD trans. Blacked outtttt
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post #5 of 16 (permalink) Old 09-16-2009, 01:59 AM
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Re: dropping fuel pressure

How big of a pickup is that? And my bet is like the others have said, all the fuel is going to the back of the tank and uncovering the pickup.

Dave

'08 F250 6.4/Torqshift Spartan 310EL, Flo-Pro 4", White_monster air intake, RCD 4-link, RS9000's 584/1330
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post #6 of 16 (permalink) Old 09-16-2009, 03:56 AM
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Re: dropping fuel pressure

I have a 5/8" pickup w an Airdog, and I know that when the tank gets below a 1/4 that it will start to suck air. You can hear the pump change pitch.

I think that the pumps pull so much, that they start to cavitate.

99 F350 CCLB
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post #7 of 16 (permalink) Old 09-16-2009, 11:33 AM Thread Starter
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Re: dropping fuel pressure

i just have the stock size pickup w/ mixing chamber delete.

2009 F-250 ccsb black/black

Lowered 4400lb spring, 20x10 MM962, Nitto 420, traction bars, 5" exhaust 7" MBRP black stack, SCT - Innovative tunes, IDP cold side IC pipe, MPD trans. Blacked outtttt
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post #8 of 16 (permalink) Old 09-16-2009, 01:32 PM
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Re: dropping fuel pressure

Quote:
Originally Posted by PowerstrokeJunkie View Post
Fill your tank up doosh...

Back to stock for now.

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post #9 of 16 (permalink) Old 09-16-2009, 05:13 PM Thread Starter
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Re: dropping fuel pressure

was just hoping i didnt install pickup wrong...doosh?

2009 F-250 ccsb black/black

Lowered 4400lb spring, 20x10 MM962, Nitto 420, traction bars, 5" exhaust 7" MBRP black stack, SCT - Innovative tunes, IDP cold side IC pipe, MPD trans. Blacked outtttt
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post #10 of 16 (permalink) Old 09-16-2009, 05:25 PM
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Re: dropping fuel pressure

Is there no baffel in the tank to slow the transfer of fuel from front to back? It seems if you have a baffel of some sort it would slow the transfer of fuel to not suck air.

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