so youre sucking air up from..?

Don't know yet. Today the plan is to check the fuel filter and heater bowl assy. Also, bypassing all WVO related lines. Mainly that just means installing the short bent line from the bowl to the pump.

Weird that it would just all of a sudden start leaking, ya know? It must be something that I recently touched, like tHe filter. That's all I can think of! Everything else is clean...

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Finally found the problem!

Fuel strainer screen in the heater bowl. Took it out and cleaned it as best I could (WVO is some nasty stuff... it had it mostly clogged up, and YES i cleaned it 2000 miles ago. I think my WVO filter is worn out.) and put it back in. Fuel pressure was idling around 25-30psi. went down the road, floored it to 35psi of boost, didn't drop under 10-15 psi! (stayed closer to 20).

And best of all, NO bubbles after I went out for a drive and shut it down. just solid diesel in the clear tube. I highly recommend making one. Makes troubleshooting quick and painless. I put the regular hose back on the feed line and threw it in the tool box. I'll use that puppy again someday i'm sure.

Looking forward to the new overflow valve (hopefully arrives today!) and I will probably just bypass the strainer for now until I can just get a new screen ordered. I just won't run any WVO till then. Shouldn't have any troubles.


Thank you for all of the advice!

Sounds like you're about to conquer it. Clear lines-that's a neat idea. I wonder if I can find clear lines that will withstand diesel in an appropriate size to redo my truck when the time comes?

That did it! Pulled the 12k trailer about 50 miles with a few big hills in the route. Fuel pressure never went under 15psi under full load, then stepping on it. I need to buy a new screen, as I believe that is why it's still pretty low, pressure wise. Not loaded it can keep up and pressureize the system to around 30psi, exactly as Tork Teknology claimed. What great products! Highly pleased with them... Spread the word!

Again, thanks for all of the advice, guys. I love this site!

so it was just the little screen on the in the heater? wow thats cool. good to here you got that pig up and running. are you ditching the wvo setup or keeping it? at least you know where to start next time, huh?

Exactly!

Keeping the WVO, but will take my filtration process more seriously from now on. I might bypass the screen all together and just rely on my filter(s) to do the work, and just change them out more regularly...