Tripac APU stalling / fuel pump failure

mndriver

curmudgeon extraordinare
Had issues last year with the fuel pump failing on my APU. I replaced it with a Mr Gasket 12D from Parts City locally.

In February this year, it failed again, but this time in Colorado so I replaced it with another one from O'Reilly's.

And in July it failed again. ????WTH????


Last week I tried to run the APU for the A/C and it would stall out.

Tested the system, it had the bad fuel pump again. OK, call the parts guy, ask for a new/different pump. He got me one in. No issues.

installed new pump.

engine still stalls out.

Replaced the fuel filter.

Still stalls out.

WTH.

So I sat down last night with a cigar, cream soda with rum and watched the dog run around the yard while staring at the truck for a couple hours.

decided I was going to pull out the fuel pickup tube and see if there's a screen or something that's on the end and plugged up.

This morning I went and looked at the installation manual. Doesn't show a pick up screen, just 2" off the bottom and open tip.

So instead of taking it all apart and looking, I just pulled the fuel line off the inlet side of the pump and blew air back into the tank for about a minute.

Put it all back together, started the A/C and.....

It runs fine now.

I suspect that a piece of debris or something got into the pickup and it was causing the pumps to work so hard, it burned them out. It was also causing a starvation issue with the engine under heavy load.
 
There's already an inline filter.
ok, but would an in-tank screen filter like i linked you too, be of any more help by having a round pickup?

even an old fashion sock filter, jerri-rigged in some way with hose clamps and maybe piece of copper or steel tubing inserted into the hose for support to the clamp.
 
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Glad your persistence worked. I had problems a few years back with mine..same exact unit & would only experience issues in Colorado. Not sure if it was an elevation thing or what. Never knew what the ultimate diagnosis was since I switched trucks shortly after that.
 
Dude, you will do anything to sit at home with the truck, rather than go out and drive it ;)
I go to Fargo Monday for them fix a 1 gal / 1000 mile leak.

Yesterday was my annual cardiologist appointment. Friday is my dot physical.

And most importantly, my youngest is with me this week.
 

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