Leaking Rear Tank

[arrowwoodlanscaping]

I have a 1994 f250 with 7.3 idi Turbo. I noticed today that I have a small leak coming from my rear tank. I havent used my rear tank in at least three months however I do know that there was some diesel left in it. I was wondering if I should replace the tank or leave it as is (will this cause any damage to the fuel system considering I only use the front tank). Does fuel get into the rear tank from the front tank on occasion even if i have my switch on the front tank? The truck is just a work truck I use on occasion so I do not want to spend money on it until the summer. Thanks

 

[Brad S.]

Had the same problem couple years ago.
Use up the fuel thats left so it doesn't get wasted.
I left my tank for quite a few months before I changed tanks, shouldn't hurt anything.
Theres not much fuel that gets returned when a person switches tanks, happens either way when switching.

 

[icanfixall]

Welcome to the forum.. You can leave that tank in the fuel system for as long as you want. No fuel is returned to it till you switch to that tank. Running off one tank will not hurt the fuel system. We have several options for different rear tanks. Some have more than double the capacity as the oem tanks too but you loose the spare tire location because the big tank takes up all that room.

 

[ethercan]

do any of the larger rear tanks fit in the 1990. the LMC catalog lists a different number for the 90 and 91 and no larger tank for that year. I have the same problem I have been thinking about trying to replace it with a larger tank for about 6 months while it has been dry.

 

[Oog]

Just fix the leak?

 

[jrad235]

do any of the larger rear tanks fit in the 1990. the LMC catalog lists a different number for the 90 and 91 and no larger tank for that year. I have the same problem I have been thinking about trying to replace it with a larger tank for about 6 months while it has been dry.

Here you go: 38 Gallons
http://www.amazon.com/Spectra-Premium-F26E-Fuel-Pickup/dp/B000C7TW5K

My leaking rear tank was actually removed entirely for almost two years. I had placed ziplock bags over the connectors when I took it out. Everything has been working great since this last summer when I installed the above tank.

Oog, what would you use? My old tank had a leak right under the fuel pickup.

 

[Oog]

http://m.autozone.com/autozone-mobi...el-Tank-and-Radiator-Epoxy/_/N-259t?id=382799

Used that on one genious' s tank when he drilled a 1/2" hole in a diesel tank to drain water.

 

[Oog]

Oh, when doing it, jack up one side, clean, sand and clean again. Used the equivalent of one can brake cleaner to thoroughly clean area around hole and patch it. Has been holding for about/over a year now?

 

[Mulochico]

One other thing to consider (though with just a "small" leak it probably isn't the issue ) When my tank selector went out it was pulling from one tank and returning to the other. I new this because one tank would leak from the filler cap and the other would stop pulling because of a vaccuum in the tank (so much so that when I release the pressure by opening the cap, the tank sides had pulled in slightly).

Got rid of the selector valve: http://www.oilburners.net/forums/showthread.php?34465-Fuel-tank-switch-bypass&highlight= been working great for 5 years now.

 

[icanfixall]

If you attempt to patch a fuel tank the suggestion of raising one side of the truck to get the possible fuel away from the patch area is a great idea. So add this to patching a tank. Use a shop vac in the fill neck to pull any fuel away from the area being patched. What this vacuum does is not really pulling a vacuum on the tank as much as its pulling air thru the repair keeping it dry till the patch is applied. You really can't suck all the air out of the tank and collapse it either because the hose will not completely cover the fill neck and the roll over valve hopefully works.