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Old 01-11-2020, 09:38 PM   #1
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Unknown port on fuel tank...?

Hey everyone,

ran into an issue that I'm having trouble diagnosing. I have a port on my F53 Chassis fuel tank that I can't figure out. The picture posted shows a barbed port sticking up from where the fuel inlet and the smaller return vent tube attach to the side of the fuel tank. The rubber hose running behind it is the line that runs from the top of the fuel tank down and around to the generator. I can't find a loose hose that should be connected to this port. Anyone have any ideas as to what is supposed to be attached here? My tank overflowed once and I think this is the reason why... I haven't fully filled my tank since and haven't had any further overflow issues. There are no warning lights or check engine codes and it passed inspection recently. Is there a way I can cap it?

Thanks for reading...

David
2006 Fleetwood Flair 31A
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Old 01-11-2020, 10:17 PM   #2
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Gas or diesel engine?

Diesel generator?

Was the fuel leak while running the generator?

Usually on a diesel engine there is a feed line to the engine, and a return line back to the tank. The fuel pump moves more fuel than the engine needs, and the extra is sent back to the tank.

My only thought is that perhaps the return line from the generator has come loose? (If you have a diesel generator)
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Old 01-11-2020, 10:20 PM   #3
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Quote:
Originally Posted by richard5933 View Post
Gas or diesel engine?

Diesel generator?

Was the fuel leak while running the generator?

Usually on a diesel engine there is a feed line to the engine, and a return line back to the tank. The fuel pump moves more fuel than the engine needs, and the extra is sent back to the tank.

My only thought is that perhaps the return line from the generator has come loose? (If you have a diesel generator)

OP says F53 chassis so Class A gasser.
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Old 01-11-2020, 11:50 PM   #4
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Quote:
Originally Posted by Solo_RV_Guy View Post
OP says F53 chassis so Class A gasser.


Thanks... it is indeed a gasser.
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Old 01-11-2020, 11:53 PM   #5
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Quote:
Originally Posted by richard5933 View Post
Gas or diesel engine?

Diesel generator?

Was the fuel leak while running the generator?

Usually on a diesel engine there is a feed line to the engine, and a return line back to the tank. The fuel pump moves more fuel than the engine needs, and the extra is sent back to the tank.

My only thought is that perhaps the return line from the generator has come loose? (If you have a diesel generator)


Itís a gasser. 6.8L V10. Fuel leaks only when filling tank full. Tank capacity is 75 gallons so Iíve been keeping the fills to less than 70 gallons.
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Old 01-12-2020, 05:32 AM   #6
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Thanks... it is indeed a gasser.
Okay then - ignore what I said earlier. Sorry I couldn't help more.
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Old 01-12-2020, 07:54 AM   #7
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I believe it may be the vent line to the canister that collects the fumes from the gas. Look for the canister and follow the hose back to the tank.
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Old 01-12-2020, 06:01 PM   #8
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another photo of port...

Got out to the RV before football started and took some more pictures. This one I labeled to help visualize what's going on. Easier to see that this unknown port sits right at the top of the tank. It's hard to see but there is a stain on the underside of the coach inline with this port where it looks like fuel has sprayed out of the port, leading me to question if this is a port where a pressure release valve of some sort would be located. Additional things I know that are not pictured...

There are two hard lines running to the engine; the high pressure line and the return line.

There is an additional line (looks like hard plastic) that runs from the engine down to the first of two charcoal canisters. Both canisters are inline with each other and connected by an additional hard plastic line. The second charcoal canister terminates into a line that is capped and vents to atmosphere. There are no open ports on either charcoal canisters or anywhere on top of the fuel tank and no emission lines just hanging around. I also can not find any open port on the fuel inlet line or the vent line where this "port" might connect...

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Old 01-12-2020, 06:20 PM   #9
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You should put your coach info (year,make,model,chassis) in your signature. That way someone with a similar year F53 can take a look at his and chime it.


Here's mine \/ \/ \/ \/ down there.
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Old 01-12-2020, 06:53 PM   #10
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You should put your coach info (year,make,model,chassis) in your signature. That way someone with a similar year F53 can take a look at his and chime it.


Here's mine \/ \/ \/ \/ down there.
Agreed... I put part of that info in my first post but Iíll have to get to my desktop and figure out how to add it to my signature so it always shows ... 😎
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Old 01-12-2020, 06:58 PM   #11
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Old 01-12-2020, 07:33 PM   #12
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added data to signature...

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Originally Posted by F4Gary View Post
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Old 01-13-2020, 07:36 AM   #13
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There is an excellent post from 2010 by IRON WORM showing the top of the F53 75 gallon tank. His post was about R&R the fuel pump but in the process, he took some great pictures. I see your tank is from an 06, his was from a 96. I imagine there might be some changes over the years but it's worth a look.
BTW, go to top of page to SEARCH, click ADVANCED SEARCH, search by USER NAME (Iron Worm) in FORD MOTORHOME CHASSIS FORUM.
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Old 01-13-2020, 10:16 AM   #14
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My 1999 tank doesn't have that extra barb fitting. I'd recommend plugging it with a rubber hose and see what happens... Photos of my fuel tank when I replaced the pump a couple years ago.



F53 – Replace Fuel Pump – 1999 Southwind 35S


..
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