Fuel Leak in Valley - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 12-12-2011, 08:06 PM Thread Starter
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Fuel Leak in Valley

The truck is getting up there in miles (rolled 286K the other day), and now I've got a fuel leak. The bowl hasn't been disturbed since I've had it, which leads me to doubt the lines, but I believe the pump is original. What would you suspect to be leaking, the lines or the pump? or the bowl itself?
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post #2 of 17 Old 12-12-2011, 09:49 PM
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USUALLY, not always, the soft fuel lines that go from the hard lines to the fuel bowl dry out and crack and begin to leak. They are pre-cut an pre-formed lines from Ford, or you can get them from say dieselorings.com. Either that or the drain switch is leaking. Either way I would pull out the fuel bowl and get the rebuild kit from diselorings.com and rebuild it, the kit is like 17 bucks, as well as those lines and take care of it all in one shot so you don't have to go back in.

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post #3 of 17 Old 12-13-2011, 03:49 AM Thread Starter
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Perfect, thank you. Would you also change the fuel pump at this point?
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post #4 of 17 Old 12-13-2011, 04:40 AM
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I've seen the bottom of the fuel filter housings corrode away and leak. This is usually due to excessive water/gunk laying in the bottom of the fuel filter housing. When you have the filter out look under the fuel heater and see if there is a bunch of crud down there. You might have to remove the fuel heater to get it cleaned out. Look for any signs of pitting or corrosion on the bottom of the filter housing.

The fuel pumps can also start to leak externally. There is a weep hole on the pump that will leak fuel if the pump is worn out.

I would start with cleaning out the valley of the engine really good. Then run the truck and see whether the fuel leak is coming from the filter housing area of the fuel pump. If it leaks between the pump and the turbo area then it's fuel pump. If it's in front of the fuel pump more towards the filter housing then I would investigate that further.

If you are removing the filter housing then now would be the time to do the fuel pump and all the blue hoses while you have it apart.
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post #5 of 17 Old 12-13-2011, 05:10 PM
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I had the same issue when I first got mine, ended up being the fuel pump and one of the lines

Eric
1995 F250 XLT 4x4 E40D

Current Mods: TW tuned, 3/8" trans. lines, BTS VB, Tru-Cool 40k cooler, 6637 Intake, 3" DP, 5" Aussies, Isspro EV2's, smoked tails/heads and 35w/5000k HID's, GM tow mirrors.
Future Mods:Rosewood Stage 2's, D66 with WW2, Intercooler, E-Fuel, T-500, SAS.


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post #6 of 17 Old 12-13-2011, 05:37 PM Thread Starter
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Well, I have fuel in both places. I'm tempted to believe it's something around the bowl, then running back to where the pump is. I ordered all the blue lines and the o-ring kit for the bowl. I'll swap all that out, and if it's still leaking I'll put a pump in it.
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post #7 of 17 Old 12-13-2011, 10:51 PM
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try this.............It happened to my friends 97 f250HD and my 96f250.

Put a piece of clean paper towel under this little sensor. Let the motor run for about 15mins. Most of the leak will occur between the metal housing and the plastic NOT the threading. The Ford dealer could not locate this problem even though they had the truck twice. Diesel will leak slow one drop at a time. The valley will be filled eventually. I thought it was my rear main seal until a friend told me that the oil on the driveway was not tranny fluid. The part is $75 at the stealer. I got mine from ebay for much less. Sensor is located on driver side of the filter housing. Good luck...

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post #8 of 17 Old 12-13-2011, 10:55 PM
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I have had 2 OBS strokes leaking in the valley, both were leaking from the weep hole on the fuel pump. I dried everything up then stuck a rag down there, tucked under the pump and found the leak right there.

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post #9 of 17 Old 12-13-2011, 11:43 PM
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If it's not the lines or the pump, it's the water in fuel sensor. Put an 1/8" NPT plug in the hole and drive it until the wheels fall off.

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post #10 of 17 Old 12-14-2011, 04:06 PM
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I had a leak in the same area and it was that black diafram thing thats under the torbo pedestal. Not sure exactly what it is, bot it developed a bad leak where it was put together.


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