Air infiltration into fuel system.

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Oct 24, 2022 | 07:52 AM

#46

NJTman

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From: Land of the Toxic Avenger

Quote:

Originally Posted by edwinsmith

Before we moved to Oklahoma we bought a 5th wheel trailer to live in for 9 months because we sold our house before the wife retired. Because I am still having the fuel problem in desperation I installed a rubber line from the tank all the way to the lift pump. It didn't fix the problem so it MUST either be in the tank or the lift pump is shot. Since it's a fairly new piston type I'm pretty sure it's a problem in the fuel tank. I have cut the hole in the bed floor and made it into a cover with screws. I pulled out the pickup strainer float assembly. I replaced the rubber line and I inspected the whole thing for leaks. I don't see the o-rings you showed but I'll look again. I need to drill out the holes which hold the rubber line nipple to the top assembly since one of them seems to be stripping out. I can put a screw and nut in there to hold it more securely. There are a couple of rubber gaskets under there but they were soft and pliable. Could still be leaking though. The strainer is probably in need of cleaning again.

I haven't done anything here in Olahoma because we've spent the last year fixing up the house and garage. Since it's cooled off some in the fall I'm about ready to do some more repairs. A few things have accumulated that need attention. I still haven't installed my D.E. 4 inch exhaust system.

Edwin

Ollie suggested that I keep the original nylon fuel lines, as they don't deteriorate under the truck (no sunlight exposure) are form fitted, and are ideal for what they do. I contemplated the,rubber line idea, but since there was zero indication the nylon lines were bad, I kept them and moved forwards.

The pigs tail swirly nylon line in my photos are quick connected to the underside of the reservoir, and slide over the brass pickup tube. Those orings are not easily seen, accessed, or replaced, as you need dental tools to do so. Harbor freight also has a nice pick set with bent ends that work perfectly. You either have to get behind the oring or stab,it,to get it out. Mine were shot, both orange and yellow. I also replaced them on the end which connects to the lift pump as well. Takes a while to get them out, and you have to be super careful not to damage the new ones with the pick putting them in.

The new orings fit much tighter than the old's, squishy originals, which is why I believe I fixed the problem.

Here is the pick set I used

https://www.harborfreight.com/6-piec...set-93514.html

Time tells ..

Glad you're doing well

koi

Oct 24, 2022 | 08:30 AM

#47

NJTman

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From: Land of the Toxic Avenger

Btw,

The red screen pod ( I am holding in the photo ) only purpose is to filter fuel returned from the engine that is deposited back into the reservoir body.

Fuel comes into the reservoir via the return line, and that disc pod filters that fuel before it returns back into the system through a small red rubber poppet valve in the bottom of the pod. It was filled with junk from years of filtering the return fuel. The filter pod doesn't have any impact on air infiltration in the supply, as the supply fuel bypasses the pod through the center of the pod, and picks up fuel below the pod at the reservoir bottom . if you clean it with brake cleaner or carb cleaner, the rubber poppet valve gets all distorted and misshapened. Don't remove the poppet valve, as you'll rip it apart and make it worthless. Make sure the poppet is sitting flat, and in about an hour, it will return to it's original shape. I found this out the hard way, and thank God for Ollie and his spare parts treasure in VT.