I've got about 25psi at idle with two pumps ran in series on my truck. I only did it this way because the Diesel Injection shop told me this was how they did it. N e ways, I'm probably going to just bypassing the stock LP and just run the one BD pump alone. I wanted to wait until the stock pump dies to do this, but if 25psi is too high I might do it right away. Oh, and I've been running this way for about 10 months now. So any opinions and input would be appreciated. Thanks...

 

25 the highest you get?

 

yeah I believe so. I don't have an in cab guage installed yet. So I don't get to watch it all the time. I need to buy one. But yeah 25psi is the highest I get.

 

the VP has an internal bypass set at 14 psi

IMHO the 2 pump setup is not a good deal

 

So what does that mean?

 

any psi over 14 does you no good

also keep in mind that pressure is simply the resistence to flow.

we measure our fuel system with pressure because its cheap and easy to do...........what we really are concerened over is the flow.........the VO is cooled and lubricated by about 80% of the total flow going thru it.......only 20% of the fuel is there for the injectors

 

Anything over 14 is no good. Really? Not that your wrong, but does everyone else agree with that? I talked to the diesel injection shop guy that sold me the IP and he was the one who told me to run it this way. He said 25 is good. So have alot of other people. I've heard 30psi is where it might be too much.

 

anything over 14 psi is being bypassed so the Bosche folks dont want over that either

 

NORMAL fuel pressure is around 15psi and if the pressure drops below 5psi an injection pump failure is probable. Remember bad lift pumps can run unnoticed until costly damage is done to the Bosch VP44 injection pump. To much of a good thing is bad.
The following are the top two most common mechanical failures:

Directly from Bosch

1) Rotor Seizure

Another mechanical failure with the Bosch VP44 injection pump happens when the rotor seizes in the distributor section of the pump. The most common cause for the seizure is a lack of lubrication. Since the Bosch VP44 injection pumps are lubricated by the fuel, weak lifts pumps can again be blamed for this failure. The seizure will then break the Drive Plate and the truck will stop running, never to start again, until the Bosch VP44 injection pump is replaced.




2) Check Engine Code 216

This is the most common mechanical failure and occurs over a period of time when weak lift pumps, with low fuel pressure, rupture the diaphragm in the front of the injection pump. The timing piston will then vibrate to a point where it wears the housing of the pump down until the fuel is able to bypass the piston. Dodge has recognized this problem for some time, and they no longer even sell the lift pump that goes on the side of the block anymore, instead they replace it with a unit that is now mounted in the tank.

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Remember more fuel pressure means more resistance in the system. Means more amp draw on the motor if it is not need (fuel pressure) why have all that load on the pumps and wear and tear on the alternator, batteries,and electrical system.

 

Here goes the next go round. I'll say nothin above 18 psi or below 7 psi, these are safe figures to live by. Many guys have had hard starting issues starting anything over 22 psi, I know and a lot don't. Figured I'd just beat a few folks to the punch there.

The dual system to me works well, I used it for some years but it has to be set up with certain elements in place or it is worthless.