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Fuel leak from unknown part.

I have a leak that is happening above the fuel filter on the engine. I'm not too familiar with all the parts on the engine and am wondering what may be the cause of the leak. It doesn't look like the fuel lines as it's above them. It's not the filter housing. Is it some sort of fuel pump?

Edit. Third photo added. Diesel foaming around that nut.
1999 U320 WTFE #5586
2014 Subaru Forester 6sp
4000 watts of solar
650 aH @ 24v

Re: Fuel leak from unknown part.

Reply #1 –
Upon further inspection, I think it's coming from the fuel pump. I'll need to clean it up and see where the leak is coming from.
1999 U320 WTFE #5586
2014 Subaru Forester 6sp
4000 watts of solar
650 aH @ 24v

Re: Fuel leak from unknown part.

Reply #2 –
Little further looking and found it to be leaking at the top nut.

Found a thread with the same issue. Fuel pump leak 99 M11

Will likely have to replace an o ring and a filter of sorts?

1999 U320 WTFE #5586
2014 Subaru Forester 6sp
4000 watts of solar
650 aH @ 24v

Re: Fuel leak from unknown part.

Reply #3 –
Good job you did it all yourself.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Fuel leak from unknown part.

Reply #4 –
Quote from: Zach –
Will likely have to replace an o ring and a filter of sorts?

Zach,

I can't stress enough that you need to have that area super clean before you remove that cap and filter. Use something like brake cleaner or spray carb cleaner to clean that area and blow away any trash left behind and you will be fine. That post you found has all the part numbers you will need. After looking at the date stamp on that thread it is hard to believe it has been some 4 years since one of these caps has been reported leaking.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Fuel leak from unknown part.

Reply #5 –
Quote from: Pamela & Mike –
Zach,

I can't stress enough that you need to have that area super clean before you remove that cap and filter. Use something like brake cleaner or spray carb cleaner to clean that area and blow away any trash left behind and you will be fine. That post you found has all the part numbers you will need. After looking at the date stamp on that thread it is hard to believe it has been some 4 years since one of these caps has been reported leaking.

Mike


I'm just glad I found it.

The whole area was covered in diesel and dirt which created a nice mud. I used a whole can of degreaser and one and a half cans of brake cleaner. The last picture are what it looked like after that.. I will be buying more tomorrow.

What would be nice is knowing the actual size of the o ring or the # for it. The o ring is now $4.20 and the filter is $31. Cheaper than I thought it would be but ridiculous.
1999 U320 WTFE #5586
2014 Subaru Forester 6sp
4000 watts of solar
650 aH @ 24v

Re: Fuel leak from unknown part.

Reply #6 –
I hate to admit that I thought I was being molested when that little filter was ~$7.50. If you have an "O"ring store close they can match it up for you and save $4 just be sure to tell them this goes in ULSD.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Fuel leak from unknown part.

Reply #8 –
Quote from: Zach –
I'm just glad I found it.
The whole area was covered in diesel and dirt which created a nice mud. I used a whole can of degreaser and one and a half cans of brake cleaner. The last picture are what it looked like after that.. I will be buying more tomorrow. 
Instead of spritzing away flammable hazardous to you solvents, head to a big box store and purchase a gallon of odorless mineral spirits and a hand full of cheap pig's bristle brushes, the $0.88, 1" brushes.  Clip off some of the bristles to give yourself something with which to scrub and go for it.  Then spritz.
Art
PS our on-line resource for o-rings is The O-Ring Store.  They ship fast but by the time you're finished you'll have spent the $4.20 because of shipping and a $5 minimum order.
FWIW I placed two orders with them in quick succession recently because, as always, I nail the 3 int4egers to the right of the decimal point.  To the left? 1" 2". something like that.

1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Charlie, the Dog was broken out of jail 24 Oct 2023
N1RPN
AA1OH (H)e who must be obeyed.

Re: Fuel leak from unknown part.

Reply #9 –
Zach,

Well, were you able to get a new filter and O ring installed and stop the leak?

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Fuel leak from unknown part.

Reply #10 –
Quote from: Pamela & Mike –
Zach,

Well, were you able to get a new filter and O ring installed and stop the leak?

Mike

Yes I purchased from Cummins. Received it in about four days. Took about 20-30 minutes to replace. Most of that was cleaning and coming in and out of the engine bay to get stuff I forgot.
1999 U320 WTFE #5586
2014 Subaru Forester 6sp
4000 watts of solar
650 aH @ 24v

Re: Fuel leak from unknown part.

Reply #11 –
I go to NAPA to find O rings. They have a good stock, especially the stores that do trucks. I replaced the two O rings in the fuel primer pump on the U300 with a cost of $0.20 for both. We are nothing but ULSD with 5% to 100% biodiesel here in California. I've not had any problems with hoses or O rings even in the '84 car.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Fuel leak from unknown part.

Reply #12 –

There are a bunch of YouTube videos about troubleshooting. I linked one below, super helpful. Brian

https://www.youtube.com/watch?v=uYzqP2BFrMk
Brian & Lisa Freeze
1996 U295 36FT Build #4914
Motorcade #18760
 

Re: Fuel leak from unknown part.

Reply #13 –
Quote from: brianefeeze –
There are a bunch of YouTube videos about troubleshooting. I linked one below, super helpful. Brian

https://www.youtube.com/watch?v=uYzqP2BFrMk

This needs to go to Atwood water heater thread.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean