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#1 07-11-2017 12:09:54

cj
Lurker
Registered: 07-11-2017
Posts: 2

fuel leak

my 96 xj with 4.0 has a leak at the rear of the vehicle, it looked like the filler neck/vent hose, so changed them, test drove it, no leaks, drove it x 2 days now it is leaking again. Ive already changed the fuel line coming out of the tank, could it be the vapor recovery line?

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07-11-2017 12:09:54

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Re: fuel leak

#2 07-11-2017 12:12:10

cj
Lurker
Registered: 07-11-2017
Posts: 2

Re: fuel leak

Also, before i changed the filler neck/vent hoses, it would only leak when the ambient temperature was low, once it warmed up, the leak would stop.

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#3 07-11-2017 12:19:13

jimmy
Helper
Registered: 09-27-2008
Posts: 22

Re: fuel leak

Definitely check the Fuel Pump. Mine was leaking and apparently had been for awhile. We would smell gas off and on but couldn't find a puddle or anything until one night the smell was overpowering we got under there and discovered the leak.

I highly recommend getting as much gas out of the tank as possible before dropping it. We had to actually drain the gas from where the fuel pump is because the hoses connected to the tank there is barriers I guess so you cannot syphon gas. Just having 1/4 tank of gas still is heavy & awkward.

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#4 07-11-2017 12:23:35

trapper96
Rookie
Registered: 04-07-2010
Posts: 90

Re: fuel leak

when I pulled off the skid plate to remove my tank I discovered that all the dirt and packed mud was acting like a plug and protecting all the rust pinholes very nicely. I was wondering why I always smelled fuel after I had pressure washed underneath the heep.....
that is what began the whole well "I might as well" episode this time around.... to drain my tank I just used a cheapo siphon, the fill tube has a bend in it inside the tank that makes fishing a hose in there an annoyance, but you'll git it done.... the other way if the pump runs at all is to disconnect the hose, run it to a container and turn on the key, let the pump do the work. either way even 5 gallons in the tank will make it awkward.
Other thoughts.....
Don't smoke while playing with fuel...(duh) I would do this outside and not in the garage also.....
Use a brass hammer and wooden dowel to remove the retaining ring if its steel, (no sparks is important around fuel vapor)
If you replace the fuel pump, get a new filter sock with it, depending on the sender assembly, you may want to replace the regulator too.
If you replace the tank.. if the sending/pump unit is in the upper front of the tank like older xj's, Keep in mind after market tanks are not as nicely made in some respects, there is a small cup in the reservoir on a stock tank, that wont be in the new tank, this holds the rubber foot of the pump assembly and keeps it from vibrating and making even more noise than they do... if you find a spring that will go over the foot, so it presses against the bottom of the tank, you can quiet that noise down quite a significant amount.

s'all I got for now, good luck.

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07-11-2017 12:23:35

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Re: fuel leak

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