Found fuel problem....but need help! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 01-15-2007, 10:09 PM Thread Starter
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Found fuel problem....but need help!

Today I checked my fuel pressure...bad.
@idle= 45-50psi
@1500rpm= 35-45psi
@WOT= 25-30psi

So apparently I have a problem....is that cause by a weak fuel pump(what Ford calls a Transfer pump) or could it be caused by a bad regulator?

Thanks for the help

e99 leveled on 35s
250/80, modded s300, studs, springs, push rods, adrenaline, swamps tuning, racerx trans
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post #2 of 13 (permalink) Old 01-15-2007, 10:23 PM
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If the reguator goes BAD, the FP will be low all the time.

You could have something as simple as a restricted fuel filter not allowing enough FLOW under power. Restrictions on the inlet side of a pump cause low output pressure.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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post #3 of 13 (permalink) Old 01-16-2007, 02:13 AM Thread Starter
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the fuel filter is only a few months old, and i had it out a month ago when i did my hpop it was still clean and i cleaned out the bottom of the fuel bowl at that time

where should i look for restrictions?

what would be other signs that its the pump itself?

e99 leveled on 35s
250/80, modded s300, studs, springs, push rods, adrenaline, swamps tuning, racerx trans
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post #4 of 13 (permalink) Old 01-16-2007, 03:44 AM
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there is a screen on the drivers side of the fuel filter that plugs up pritty commonly. If i remember rite you have to pull out two bolts that screw in from the side. then you can move a block that has a couple of lines going it to it, over just enough to clean the screen.

Ross
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post #5 of 13 (permalink) Old 01-16-2007, 03:48 AM
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https://www.thedieselgarage.com/forum...1&d=1158384628
The block is the regulator, labeled in this pic.

Ross
Show-ME Smokers 2.6 modified street pulling truck "The Lone Stroke" My Videos
1996 f350, powerstroke, 4x4, 5-speed, 4.56 gears, Swamps 450/600 injectors, Swamps BFH turbo, Swamps Idm, Swamps tunes, BTS oil, SBC clutch, studs, springs, tubes, air to water intercooler, fuel system, factory rods!


Tow Rig
1997 f350, srw, reg cab, 4x4, 5 speed, 4.10 gears, 3in down pipe, straight pipe, mystery chip.

Becker Brothers Enterprises
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post #6 of 13 (permalink) Old 01-16-2007, 03:57 AM
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The "sock" in the fuel tank can get clogged, not common but I have seen it a time or two.

Also, fuel HOSES can collapse internally, this is a favorite of the CAT 3406 engines. Done a few (hundred) of them.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

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post #7 of 13 (permalink) Old 01-16-2007, 10:19 PM Thread Starter
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today i cleaned the screen,with no change.
it was dirty but not really clogged

is there a pre filter on these under the truck that could be clogged? if not i'll be putting a fuel pump in....

e99 leveled on 35s
250/80, modded s300, studs, springs, push rods, adrenaline, swamps tuning, racerx trans
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post #8 of 13 (permalink) Old 01-16-2007, 10:32 PM
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Only the "sock" in the tank.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

I vote for LIBERTY!
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post #9 of 13 (permalink) Old 01-16-2007, 10:39 PM Thread Starter
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looks like its fuel pump time

e99 leveled on 35s
250/80, modded s300, studs, springs, push rods, adrenaline, swamps tuning, racerx trans
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post #10 of 13 (permalink) Old 01-17-2007, 11:48 PM Thread Starter
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just for reference what should my pressure be at idle and at given rpm?

thanks
~Tim

e99 leveled on 35s
250/80, modded s300, studs, springs, push rods, adrenaline, swamps tuning, racerx trans
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