Engine/Transmission (1998.5 - 2002) liftpump option?

[SEmerson]

Has any one changed to a aftermarket cam to get a fuelpump lobe. Then added a 12v fuel pump and a regulator. This is the best solution I have came up with to fix a 24v right.



My mallery will not last long running all the time. I have use 3 sets of brushes and now the armature is shot. I have thought about using it as a boost pump to come on only when pressure is low. And running the stock lift pump for low power times. Like cruesing and when you step on it and dip the presure a presure switch could turn on the mallery. Then put a regulator on the out of the fuel filter to hold down the pressure when both pumps are runing.



Any thoughts???????? :-{}

 

[Ncostello]

I've thought about this before. If Cummins had gone ahead and installed cams that had the lobe... it would be a no brainer. But the new 24V cam must have been a little different than the previous 12V cam. Thus when they machined them they didn't need to include the lobe. If it were the same cam as late 12V's, then it would stand to reason some trucks would have the lobe. We all know how Cummins likes to use up old parts till they are gone... timing gear cover comes to mind.



But you're right... that would solve alot of electrical pump problems. However the amount of work required and the cost involved would be more overall than replacing several lift pumps. I expect a stock Carter to give nearly 100K of service. By relocating it that may be possible. There are some who have gone beyond 100K on a totally stock truck and the original lift pump... so I know it is possible. If I replace one every 100K... I'll be content with that. Mines relocated with a fuel/water seperator before the pump to keep the thing clean. If I ever need serious engine work... I'll really consider that while I'm in there.



Just one of many opinions on this I'm sure. It is the end-all fix however.

 

[SEmerson]

I have alway had problems keeping high fuel pressure. And I put on alot of miles. I am also in need of my 3rd vp44 so I would like to solve the pressure isue for good. The reason I said a aftermarket cam was to get a 24v grind with a 12v lobe.

 

[rashwor]

I asked Cummins about this...

a couple of years ago. Just ask the power master. I never pursued it bacause of the cost we were looking at. We are talking over $1000, but I don't remember specifics. Cummins was not sure that the mechanical pump would provide enough pressure at all RPMs. I never got serious and pushed the issue to find out.



Relocating the lift pump back by the tank seems to be pretty effective and a whole lot cheaper and quicker. Check out the thread "Saving Private Carter" on this form for some really good info on relocating.

 

[zstroken]

pump cycling

one problem with the pump coming on by low fuel pressure is as soon as the pump comes on it will probably provide enough pressure to shut the pump back off unless you mount the switch before the booster pump or develop different start/stop pressures

 

[SEmerson]

I thought about the cycling on and off. I figured the it would pulse under load but that that was ok. Also if you ran larger lines you would pressureize the lines and filter to give a little pressure reserve.