New V3 install not building pressure...ANY IDEAS?

[GOON924]

OK...just installed the V3 system to my 2000 7.3 F250. Been working with Jason and John from DFA troubleshooting this thing all week, literally every night trying something new. I'll try to list all we've done so far (no particular order):

• Believe all electrical is OK, pump runs, purges, engine keeps running after turning off key, etc.
• Cleaned pre-filter, was dirty, but really didn't change pressure any
• took main filter off module to see if had oil, it did, and turned to manual to see if pumping...all OK
• Removed and cleaned out fuel pressure regulator
• Jason actually sent me new pump thinking that was problem, no change, still no pressure (confirmed reinstall was correct for new pump).
• Took off fuel-in line from tank and fuel-return line to tank and blew out with compressed air in case there was obstruction in lines. No change.

I know I'm probably forgetting a few things. I have a pressure gage installed to the pressure test port by removing the Schrader valve. All readings are only about 25psi. When switch is in manual mode and turn the regulator all the way in, pressure does not increase. Sounds like all oil is being bypassed back into the tank.

Last thing I'm trying is just plumbing the fuel lines into a bucket (directly below the module so hoses only a couple feet long) in order to eliminate anything outside the V3 and should determine if it's the V3 itself or something in my plumbing.

If anyone has any other ideas, I'M ALL EARS and will try ANYTHING at this point! I'm determined to get this thing running...it's costing me almost $25/day with my commute to work for every day I don't get this working. I know this is an awesome system with generally few flaws, just having a few start-up issues. Also, if anyone is local to the Atlanta area and has more experience with this system, I would greatly appreciate any help.

Thanks,
Keith

[tacit_k]

About the only thing I can think of is to cap off the fuel line from the V3 to the engine and see what pressure the return develops. if the return is at full pressure then the regulator is bad or the purge is sticking.

[GOON924]

About the only thing I can think of is to cap off the fuel line from the V3 to the engine and see what pressure the return develops. if the return is at full pressure then the regulator is bad or the purge is sticking.

I've actually tried that. It does increase the pressure. However, I think the test to check if the purge is sticking was to squeeze the return fuel line from the V3 to the tank. If it didn't move, the purge valve should be OK. And of course, it didn't change the pressure. Also took out and cleaned the regulator with some compressed air, reinstalled, and no change.

[Elvia]

Goon, sorry to hear about this problem. Hopefully, all our brains will solve your problem. Keep all of us posted so that we can add this to our collective knowledge.
Hope you are Greasing soon

[greasyX]

memories

I believe I remember this one from old forum.Same problem,different guy.Is your vent to your tank installed,if so properly?I remember it being some thing silly like vent line blocked,plugged of with a bolt to prevent leakage? Jason or James do your remember this I think it was 3-08/4-08?The guy didn't want it leaking on the driveway or something.Hope it helps.P.S. check your pre filter (50 Micron screen),use big Allen Key that came with kit.U may have sucked up aluminum particles from the tank assembly ..................grease out

[ptp.vegistroke]

prime the line from the tank..

[GOON924]

Yes, tank is vented properly.
Yes, cleaned pre-filter, there was junk I think from the tank manufacturer.
Yes, primed tank line.

All...still no pressure.

So, I went and made up 3 hydraulic hoses and just pulled from a bucket directly below the V3. Looks like pretty equal amounts of oil are coming out both the return line to the tank from the V3 and from the V3 to the engine the entire time. But, still no pressure builds up. Checked solenoid, too, to see if it was working, and it was.

Talked to Jason this afternoon and sending the V3 back to him Monday. Hopefully is something in the V3. He's going to bench test it and see. My (and Jason's) biggest fear is that it will bench test fine. I'll post the outcome and solution when we find one.

[captgrady]

maybe if there was air in line of pressure gauge, it was in-correct, you had pressure, but your presuure sensor was bad? what are the odds 15-1? I got 5 on it. Good luck!, you'll get going soon.

[Clay]

it has to be in the V3 module...a machined passage done incorrectly maybe.

[lancaster,pa]

Any chance the check valve in the engine may be malfunctioning and allowing veg to be pumped into the diesel tank? Seems like that could keep pressure from building. - Patrick

[GOON924]

it has to be in the V3 module...a machined passage done incorrectly maybe.

I truly hope so, otherwise I'm stuck back at the same point I am right now without too many other diagnosis to work with. But, I'm not too worried, I know we'll figure it out one way or another, and I'll be burning grease in no time!

[Clay]

I truly hope so, otherwise I'm stuck back at the same point I am right now without too many other diagnosis to work with. But, I'm not too worried, I know we'll figure it out one way or another, and I'll be burning grease in no time!

there are only a couple of things it could be and sounds like you have tried most of those...meaning your getting close so don't worry, I'm sure Jason will get it figured out soon.

[GOON924]

All it good!!!

...don't worry, I'm sure Jason will get it figured out soon.

AND HE DID!!!!!!!!! So I sent the V3 back to him, he benched tested it, and gave me a call with the results. The conversation started something like "well our greatest fear was that I'd bench test it and not find anything wrong, and I didn't find anything." In this brief moment, my heart dropped and didn't know what I was going to do next. Then after a pause (thanks for that BTW Jason!) he went on to say that he then hooked up the return line as it would be on the truck and found the same thing I did and that all the oil was being returned back to the tank and not allowing the V3 to build pressure. So, basically the V3 itself was faulty...lucky me...the only problem like this known to date. I'm sure Jason can give a more technical explanation because I didn't hear much after he said that is was the V3 and not some bone-head thing that I did. Well, I received a new V3 and plumbed it back in, and it worked flawlessly!!! It built pressure right away and switched to veg in about 3 miles. Look forward to many more greasy miles!!!!!

Thanks Jason and John for all the help...and patience!

[Elvia]

congrats and welcome to the club. I hope they do give a brief on what happened, just for curiosities sake.

[triplemoutdoors]

He hit the nail on the head again!

it has to be in the V3 module...a machined passage done incorrectly maybe.

And he does it again...Clay the eBench Tester!