Leaking Fuel - not consistent - Ford Powerstroke Diesel Forum
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Old 04-29-2013, 06:16 AM
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Leaking Fuel - not consistent

My '95 7.3L leaks fuel from the rear tank. I have read many threads about rusted tanks, but mine seems different. It can be bone dry underneath the truck for hours or days but then suddenly I'll find a 2' x 2' puddle under the rear tank. My assumption is that temperature inside the tank is affecting it or something. I can fill up the rear tank and burn through it without any problems on long trips (or I may not notice it), but if it sits it will leak. It only does it above half a tank too. If the tank is low, it doesn't leak. I don't really imagine a rust leak at the top of the tank, but it's possible.

The previous owner said another former owner had a refill tank in the bed of the truck. The owner before me believed it leaked because they removed the refill tank but didn't cap off the feed hose to the bed.

I haven't been able to get a good view under the tank to see where it is leaking. As this is my first PowerStroke I figured that someone may have had a similar experience.

Any thoughts? Thank you.
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Old 04-29-2013, 11:55 AM
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Certainly sounds like a leak in the top half of the tank, maybe fittings?
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Old 05-01-2013, 08:03 AM
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I had same problem on my side mounted tank infront of axel. a rock worked its way between strap and tank and rubbed hole in there. the hole was pin hole and like you said, below half wouldn't do it. best bet is drop the tank, or at least take one strap off at a time and inspect.

if it was fittings or lines would do it all the time. new tank cost me bout $150 but some are worth patching In my opinion just use a good quality material to patch with.
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Old 05-01-2013, 09:01 AM
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I'm dealing with a similar problem. I actually went as far as replacing the whole rear tank and buying an OE sending unit and it still leaked. Come to find out it was Fords quick connect fittings it was leaking from
You may want to look at those fittings.
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