dkenny wrote:
before you think I'm nuts..
consider the other common rail diesels..
duramax, cummins, VW.. these all use the CP3
on Cummins..they use a lift pump 10+ PSI..so what's the issue? worried because Jeep has a design issue..just be glad is not a VP44 that croaks at less then 7psi.
this feeds a gear pump. not a diaphragm pump.. I'm not suggesting using a 50psi pump to feed the CP3..just something more than a vacuum..maybe like 5-10psi..be sure it will draw a vacuum..think 20 inches..yes I measured it once..
why?
consider your choice of fuel heads.. 2 in and 2 out..
plug one in..put the lift pump between the tank and the 'new' head on the other in.
the outs..
here's where life can be good...
1 - goes to the CP3...
2 - add a valve..a line and a 'T' into the existing return line...hmm?? this isn't my idea..so I not claiming it..BUT ITS A GOOD IDEA. why? well..instead of pumping a priming bulb you'll just have to open the valve and bump the starter..turn the key on..maybe a couple of times..not sure it can get much easier?
in case you're wondering...my wife's jeep is setup just this way..but her's has a Racor fuel head..
its up to you what you choose..since you live in the land of the Cold I would suggest something that keeps the fuel heater.
-dkenny
ps if I could figure out how/where to install an airdog 100 I would..without question..
All good stuff. I think if I could figure out where to put the airdog, I might just borrow one of the CAT Quad heads that is on some of the earth movers at work. Sure it would cost about 300$ to replace the fuel filter(s), but I am pretty sure I would only have to do it once.
I had thought of teeing the output line into the return and running a lift pump. This would give me some very slight positive pressure from whatever the resistance of the line is. This would eliminate the worry of having positive pressure into the CP3. I would then tap into the fuel temp sensor, and put a heater that was controlled outside of the ECU. From what I understand about the stock heater, it isn't thermostatically controlled, but rather made out of a positive temperature comp material. I haven't metered the heater lines for voltage to confirm, but think I read it someplace.
I have a Perma-Cool dual in and out head ordered that will fit the CAT filters. I may play around with this and see if I can get it working. Is there a cheaper lift that the Kennedy? 200$ seems kind of spendy.