5.9 cummins

I have been told that wix filters some time dont seal so i ordered a luberfiner filter.

That's not a variable you described when swapping lines from bucket to tank. Don't know how a part that had no impact, will help.

funwithfuel said:

That's not a variable you described when swapping lines from bucket to tank. Don't know how a part that had no impact, will help.

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I think some were it has a opening in the fuel system that dosent leak fuel but lets air in when it shut off. I had seen this before. One time it does one thing and the next it does something diffrent. I thought it was sucking air in the return but from were some one has taped a hole in the suck side of the lift pump inlet fitting and run the line to that? The new hole isnt that great or strait so i replaced the fitting and used alot of sealer on it but that didnt help. Why can i put a 3 foot hose on the return and it will work? We have thought about runing the return back to the tank like factory but it was working the way it was. Why did some one reroute the return ? It was done when it was 2 years old before the now owner bought it. This thing has me stumped.One resone i am replaceing the filter is a good pump guy told me he had problems with them sealing.

I'm willing to bet you have your return line submerged in fuel, when you're in the bucket. That prevents a siphon break.
I believe you're on the right path. You are getting air intrusion, the question is where.

You replaced the overflow, correct, with good soft copper or aluminum seal rings. No chance of rust or paint chips preventing a good seal?

We had the line in fuel . It would start. So i pulled it out it started. The line is clear so i could see and was told by the pump guy it would suck back and it did a little but it would set over night with the line runing down hill over a drain pan and it would start but you could see it had fuel in it.

My boss has one the same year its been modified so it has extra lines and filters. I was going to service it one time it had leaks every were but he never noticed it .It started fine.

The only variable seems to be your tank. Is it difficult to get the sender out. Perhaps you have some junk stacking up in the stand pipe or debris plugging the inlet strainer. That doesn't explain the night time bleed off though.

Do you have a grid heater or flame start? I have seen the flame start nozzle to the intake cause all sorts of shenanigans. Just something to look for.

Sorry, totally forgot your working on a pick up

funwithfuel said:

The only variable seems to be your tank. Is it difficult to get the sender out. Perhaps you have some junk stacking up in the stand pipe or debris plugging the inlet strainer. That doesn't explain the night time bleed off though.
.

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Its has a flat bed so the pickup can be pulled. I ordered a filter yesterday from OR parts he said he could get a luberfiner filter and i would have it today.I went there early no filter they cant get luberfiner stuff? I went to the shop and blocked of the line from the tank to the engine at the engine and blowed air in the tank end. It had a break were the rubber clamps to the steel line. I replaced line bleed air out started it left for a hour it wouldnt start. I pumped it up tryed to start it in 10 minites no start. I pumped it up started it then clamped off return line started up ok. I pulled new overflow valve i could blow throw it and it wouldnt hold fuel on top of the ballbearing. Tomorrow i am going to the place were i got the valve and get a filter and valve. We fixed the grid heaters they work but its been in a heat building all but for one time when we had it outside a short time.

Its unfortunate you got a dud valve. Really glad you found it though. Too often we tell ourselves, can't be that, its brand new. At least you avoided that trap
Happy new year

Dam.. that's some bad luck.. did u buy the part # I had given?? Did it come in a Bosch bag??

thepumpguysc said:

Dam.. that's some bad luck.. did u buy the part # I had given?? Did it come in a Bosch bag??

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I got it from a local cummins dealer i dont know what brand it is. They are very good to deal with if they say they have had a problem before i may drive to the nearest pump shop it will be a 3hour trip.

Dam.. just googlewho> diesel inj. pump shops near me.. & getm to send u 1.. a lot easier than the drive.
Did u try "back blowing" it>> u might have some real sh!tty fuel.?? sticking the ball..

I looked at the one i got and it was a bosch. I went to the place were i got it and looked at another it was just like the one i had it didnt seal. I got a luberfiner filter there and when i got back i replaced the wix filter and put the old valve back in. I started it and shut it off it started. It was 12:00 buy then so i pulled it out side. At 5:00 it started right up it was in the upper 20s today. The luberfiner filter looked just like the wix other than the seal. The seal fit alot better.I think all this time the filter seal was leting in air but never leaked fuel. The pump guy ask me right off if i was useing a wix he went off about wix filters. I will know forsure in the morning.

The fuel heaters cause air lock problems on the dodges. I've deleted a couple of them to solve air lock problems. Not hard to do. I usually take it off and saw it off till only the spacer is left between the pump and block.