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Old 04-09-2011, 07:30 PM
jvbarrac jvbarrac is offline
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Default Pressure Troubles

I haven't run my truck on WVO for a few weeks (just been giving it some time to drink a little diesel) and am now having pressure troubles. I pulled out my tank last week and gave my bed a good cleaning. I filled my tank last night with good oil and put on a fresh donaldson and allowed the kit to run on auto this morning- no green light. I previously attached a permanent pressure gauge where the schrader valve used to be so I am able to read pressures accurately. On diesel, the gauge reads 50 psi, I purged it to zero and turned it on manual and got 30 psi. I checked the pre-screen, it was perfectly clean, then i pulled off the pump. It had a small piece of rubber (about half the size of a tic tac) sitting above the gear. I cleaned the gears and poured some fresh canola on them and reinstalled the pump. Now I have only 10 psi. Somebody help!
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Old 04-09-2011, 08:18 PM
Clay Clay is offline
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Replace the O rings in the pump. Jay sells a kit for that.
Also check that all your connections to the fuel pickup line are tight. You could be sucking air someplace.

Last edited by Clay; 04-09-2011 at 08:20 PM.
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Old 04-10-2011, 04:29 PM
jvbarrac jvbarrac is offline
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I am hoping that its just an air leak and not something worse. Is there any chance that the pump is weak or would it start blowing fuses if that was the problem? I'm clipping a bit off the end of all lines today to make sure I have a good seal hopefully that does it.
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Old 04-10-2011, 04:38 PM
Clay Clay is offline
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There is an O ring inthe pump that would cause this if it were not sealing right.
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Old 04-12-2011, 11:10 PM
jvbarrac jvbarrac is offline
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I checked all the connections upstream of the pump and they are all air tight. The O ring looks just find, there is no deformation and it sits just right into the recessed area. I have had problems with this o ring before and each time it would end up leaking oil rather than sucking air. The seal seems to be tight and the pump doesn't sound like its gulping any air. I have been looking for the o ring on the BFT site but only see the maint package for $90. Not a good deal if I only need the o ring. Any other ideas that could cause this low pressure that wouldn't cost anything?
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Old 04-12-2011, 11:17 PM
Clay Clay is offline
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You mentioned finding a small piece of rubber when you took the pump off. That is likely related to your issue. Where did it come from? That's the big question.
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Old 04-13-2011, 02:46 PM
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Mdub707 Mdub707 is offline
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Wouldn't hurt to remove the pickup tube from the tank and make sure it's clear of obstructions and in good shape too.
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Cause his job is to make oil and break things.
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Old 04-13-2011, 04:36 PM
jvbarrac jvbarrac is offline
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I think it came from the supply hose when I took it off of the tank. I really had to work it off the tank the day I removed the tank and it probably just got chafed off of the tube and somehow found its way around the pre-screen. I guess pulling the draw straw might be another possible solution. I just wanted to add, when the truck is turned off and I turn the kit on manual, I can hear what sounds to be a sufficient amount of flow coming back into the tank through the return. Maybe this suggests that flow volume is ok but for some reason flow pressure is not. Clay, how much is the o-ring and where can I get it?
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Old 04-13-2011, 07:31 PM
jvbarrac jvbarrac is offline
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Got it! great suggestion Mdub, its somewhere in the draw straw. I unhooked the supply line from the draw straw and submerged it in a cubie of golden goodness and walla 80 psi! So now onto the drawstraw, I removed it and blew into output while covering the input and it appeared to be airtight. I would imagine that there is a small leak where the plastic part of the straw meets the aluminum at the top. I was thinking about degreasing this area and covering it with an ultra black gasket maker (this stuff seals everything!) Anyone have any other ideas? Thanks again Clay and Mdub!
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Old 04-13-2011, 07:57 PM
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You can order lengths of tygon tubing from Mcmaster Carr, I'd get that, since you have it out already and figure out a way to extend the line and weight it/tie it down to the middle of the tank. This will alleviate sloshing issues/sucking air when the tank is low. What tank do you have? The standard 51 gal? You can pull the fuel level sender out, and weld a ring on the bottom to clamp your new hose too. Muns has done something similar to his, I bet he has pics of it somewhere on here. Probably in his photo albums. That dude has pics of everything!

Glad it was an easy find/fix.
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