Personally, I haven't seen one crack. What the 85 or so and newer fuel sumps are set up like is a big round plastic sump with a screen in it, and they tend to break off at the steel line. This will be about 1/4 tank or so, and if the sump has fallen off, it won't be able to pull the last out of the tank. 83-4 trucks had a simple rubber hose sticking down to the bottom of the tank. I replaced my sump that broke off and put a poly hose on, and it works fine, will dry out the tank pretty good now. My dad had an issue with the passenger inner fenderwell rubbing through the steel line, put a pinhole in it, and it was less than a foot away from the mechanical pump...

 

don't know whether they'll crack or not, but BOTH sump pieces on both tanks (how lucky could one person be) just kind of disappeared. all i found in either tank was a glob of plastic gooey clump of stuff that was left. gonna take advice and put fuel line on bottom of rear sending unit and hope hte new unit in front tank lasts a while.

speedrdr

 

ever run biodiesel in your truck?

 

nope, never run biodiesel at all. only thing i've run is straight diesel with diesel clean occasionally and have run red once when ran out of fuel in middle of nowhere. started running mix of low ash 2-stroke oil in tank. can't say what previous owner did. bought truck with 170K miles on it and it sat idle for 2 years. maybe it just tried to revert back to nature? LOL

speedrdr

 

I've been running commercial B5 soy biodiesel for over 7 years now with excellent results.

 

My 86 has one tank that takes exactly 12 gallons I think it is supposed to hold 19.

I did all my return lines with a kit I got from NAPA with a part number someone posted here. It cost about $80 and I think it is from a 7.3, the lines are cloth braided and the hose is slightly larger. It was loose on the return liine fitting but it clamped on good with a screw clamp.

I am running a quart of 2 stroke in each tank and the diesel has a nice blue color. The trouble with running ATF is it would probably dye it red and you would be in trouble if you got checked.

 

would consider running biodiesel, but only way to do that is make it myself. down in the deep south, nobody's bothered to commercially produce and make it available. BTW, all the stations here have gone to low sulfur product at the pumps. was hoping for a little bit longer of the real fuel, but guess there's enouth of the new trucks on market to make the stations convert. guess i'll just keep on adding two-stroke oil to tank to keep everything lubed in the IP since general consensus is that low sulfur fuel doesn't lube as well in the fuel system.
don't want to be replacing THAT part yet. wife absolutely hates the truck and wants it to die, but i love it. think she hates it because she has short legs and cant get in truck easily and cant reach clutch pedal.
speedrdr