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Throwing this out there to see if I can get some help. Leaking fuel on the top of the engine and I have narrowed it down to the fuel cap. Questions are these? 1. Do I have to replace the cap or will the O-rings ... JOIN NOW TO REMOVE TRACER

7.3 Fuel Leak on top of engine

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Old 01-26-2010, 11:30 PM

Default 7.3 Fuel Leak on top of engine

Throwing this out there to see if I can get some help. Leaking fuel on the top of the engine and I have narrowed it down to the fuel cap. Questions are these?
1. Do I have to replace the cap or will the O-rings do?
2. Where do I get the O-rings?
3. Should the fuel heater be replaced also?
Look forward to the replies.
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Old 01-26-2010, 11:59 PM
Diesel Wrench


New gasket comes with new filter.
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Old 01-27-2010, 11:34 AM
codiesel's Avatar
Diesel Enthusiast


this happend on mine and it was the little fule valve on the back side it is yellow and i opend and cloesed it a few times and it stoped

but you might have to get new orings for it but im almost positive thats were you leak is

codiesel's Sig:1999 F350 Powerstroke 7.3 -- Ext. Cab SB -- 5" Exhaust -- SCT -- Pyro, Boost, Trans Gauges
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Old 01-27-2010, 09:13 PM
CSIPSD's Avatar
Diesel Bomber


Put a new fuel filter in it, which will come with the gasket...

If that does not stop your leak then your drain valve is leaking and you can get a o ring kit for it.

CSIPSD's Sig:www.powerstrokearmy.com
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Old 01-27-2010, 09:27 PM
cody73's Avatar
Diesel Fan


Im with him just go to any parts house and get a filter because it comes with the O-rings rather than looking for the oring kit

cody73's Sig:1997 f-350 4x4 crew cab Project, and 96 F-350 single cab dually workhorse 10k mod, and ebpv jake brake mod
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Old 01-28-2010, 08:25 PM
yeehaw's Avatar
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not sure if this is the problem but throwing it out there, just fixed on my friends '95 he had the screw that holds down the fuel bowl heater had cracked the fuel bowl and was leaking into the valley

yeehaw's Sig:2006 F250 SCLB 6.0,SCT tuned by Eric, napa #4490, MBRP exhaust, dual 5 inch tips, 20 inch harley wheels, harley headlights, led tails,'08 tailgate, custom painted
1996 F250 SCLB, 7.3 psd, 313k , E4OD rebuilt at 305k, TS chip, S&B intake, shimmed FPR, 203* stat, 3 inch downpipe, 4 inch straight exhaust, 5 inch bullhaulers(sold 6/30/10)
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Old 12-18-2010, 09:20 PM
Diesel Fan


All good answers out there. I had leaking issues and found that the fuel was leaking from the drain valve(yellow plastic body behind the fuel bowl). I ordered only the 2 o-rings for $10.00 from DFUSER Deisel Performance Products and replaced only the o-rings. Fixed my problem!

powerstrokin02's Sig:Ford 2002 F-250, SDPS Lariat 4x4 Crew Cab, 316k, Superchips, K&N Air Filter, 4" SS MBRP, dual 5" chrome tips, BFG 75R-16-295 AT, Leer topper, hidden slide-out tool boxes, rear air bag suspension.
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Old 12-19-2010, 04:04 PM
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i've recently had these issues. heres what i had wrong.

Fuel bowl/heater/water fuel seperator had a pinhole in it, pitted from inside-out.
Drain valve on water fuel seperator was leaking from bad o-rings, ford sells the whole valve for 47$ rather than buying the o-ring kit for 35$.
O-rings on fuel line fittings leaking, replaced the fittings themselves because they have screens and check valves which can clogg, so i figured why not while im at it.

All good answers from everyone, im sure someone covered it here. just gotta clean everything up and look around

DieselDanBoy's Sig:97 crew cab xlt psd, 330k, 33x12.5x16 Mastercraft Courser A/T's mounted on Micky Thompson classic II's, Bumped fuel regulator to 75psi, HPX Crossover line, home made cold air intake, dp tuner, 3"mbrp downpipe with custom 4" exhaust, Mag-Hytec trans pan, valve body with oversized valves and springs/bully dog shift enhancer, oversized trans cooler
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Old 12-19-2010, 07:57 PM
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I had the same issues, replaced the o-rings on the fuel bowl drain, and it was done

OceanDiesel's Sig:*E'99 F250 ECSB--Twisted Trans--D66 Turbo--Full Force Single Shots--6637 Intake--MBRP Duals--Swamp's IDM--Swamp's tuned--ITP HPX--ITP CCV--RiffRaff Regulated Return--Phantom Pyro, Boost, Trans. Gauges--305/70/16 Fierce Attitude's on Ultra Rogue's--07 headlights--TGC Shocks/Steering Stabilizers
*'95 F250 ECLB Auto--RDP6637--Diamond Eye Duals
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Old 12-22-2010, 07:48 PM
powerstroke312's Avatar
Diesel Fan


i agree with ocean diesel i had same problems all i did was pull fuel canister off and looked for cracks or holes cleaned it out and the water seperator put new o rings and gaskets now im leak free! while u got it off might as well replace all the rubber lines they could be cracked like mine were

powerstroke312's Sig:97 f-250 powerstroke 160cc split shots,e40d,straight pipe to 6 inch stack, 4 inch lift 35s,boost,egt,tranny temp guages,82k
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