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Some day if I ever get un-cheap and buy a go pro, I will video the Ramcharger's 6bt spinning 4400 rpm at 50 psi of boost. It's a symphony I tell you.
interesting. I would have thought my '89 VE would be the same as your 5.9. but.. since it's an aftermarket upgrade from a VE to PPump style.. no telling what that stroke actually is. or if the cam lobe is the same for each.. seems to be lots of variables. I know those cummins lift pumps aren't cheap.. but getting the pump that fits your serial number might be the most solid start..? still.. great to hear that it's running. if you think it may be the block lift pump, can always hook the kennedys up in series, bypass the block pump and run it straight to the filter. that should produce ~ 16psi, no?
There are 4 pumps of the piston variety for this application. For our purposes the only facts relative is if you have the thick spring, then you should be making around 28 psi ish at idle. The spacer is required and is there because the same piston pump is used on other Cummins series. The B series requires the spacer. It's possible you have a bad pump, it's happened before. It's possible you have a bad relief/pressure valve on the pump, that happens also....but the reason behind eliminating the entire fuel system other than the piston lift pump is to determine if you have a issue with the piston pump or if your fuel system is the issue. I run these engines almost daily, a can of fuel, a fuel line and a OEM lift pump, and they will perform perfectly. If yours doesn't when isolated, you know the issue is lift pump related. On a side note... if those electric pumps are not producing the volume of fuel the lift pump needs, it will be limited to producing only whats available. A suspect issue when you see no rise in fuel pressure with RPM initially. A further example: Patch has a high pressure lift pump and a boost referenced bypass regulator and OEM fuel lines. I just looked at the fuel pressure gauge tonight. It idles at 29 psi and makes close to 40 at 2500rpm. I have it set to run the VE at 15psi but that said... your pump should act similar. Starvation could be affecting it's output.
I think I'll buy a lottery ticket. I never thought I'd see this thread alive again. You are really close Don. I think the front springs are flat because you have a 900lb bumper on it. Sent from my iPhone using Tapatalk
I think I'll buy a lottery ticket. I never thought I'd see this thread alive again. You are really close Don. I think the front springs are flat because you have a 9000lb bumper on it.
I just don't want to wind up missing a digit or limb. I can sometimes get in a hurry to get results.
Those batteries did pretty good for 6 months!!! I think if you do the fuel can setup its going to run, let it charge all night and try it in the morning.
well.. that's not what I/we were hoping for. but at least you have narrowed it down by a large factor. I wonder if there is any chance the larger lines, and double supply lines are causing the issue. (I havent looked into the double feed setup enough to know.. I'm sure norm has an idea) again, just spit balling ideas. I've always seen the double supply lines on big number cummins setups.. not sub 400hp motors like I (and is guess you) are going for. nothing wild, just reliable. either way, it's getting much much closer than it was. which is awesome.
Now the next test: With the truck idling, slowly pinch off the return line coming out of the injection pump while watching the gauge. If the pressure stays the same, it's the lift pump. If it climbs, the problem is in the injection pump....takes 2 seconds to find out.
I can picture Ken sitting in his office waiting wringing his hands... Stlaser is checking wine tasting schedules and sipping his morning coffee eyeing the latest UFO sighting location maps and....
Rogue Hippie. Bahahahahhaha
Quote from: OldKooT on May 17, 2016, 09:45:54 AMI can picture Ken sitting in his office waiting wringing his hands... Stlaser is checking wine tasting schedules and sipping his morning coffee eyeing the latest UFO sighting location maps and....Shawn gone rogue hippie on us ya think?
That's pretty cut and dry...but one last thing (I promise). Pinch both of those p pump hoses at the same time. You should be able to get a reading just before it dies.
Something is defiantly amiss. Ken has a good point...you'd have to pinch both lines to actually dead head the pump. That said, the falling fuel pressure is rather suspect as a lift pump failure. So you should be running by noonish tomorrow :D