Flatty

I read the codes on the truck, and I got P0216. It says this is the Fuel Inj Pump Timing Failure. What does this mean? How do I fix this problem?

THanks
Dima

BigBlue

That's kiss of death code for the VP44. Not a good thing. It means your injection pump is on it's way out.

J BODY

Check lift pump psi and volume. Check inlet side for restriction. Make sure fuel filter is good. If all the above check out and code resets you'll be spending four digits on an injection pump.

Dr. Evil

Ditto that....

Most likely the VP-44 is dead but checking the fuel pressure is still a good idea

......welcome to the club

MnTom

Also check the overflow valve on the side of the pump. I have been reading that the overflow valve can trigger the same code even with a good VP.
Tom

J BODY

I think you have your 12 valve hat on Tom.

Dr. Evil

Nope, Tom is correct. There is an overflow valve on the 24V - check it out (#12):

http://www.dodgeram.org/tech/dsl/mt_...l_sys_comp.htm

Flatty

Does anyone have the part # on the overflow valve?

Thanks
Dima

J BODY

Yes I work for DC, got thrown into the CTD gig in 99. It's interesting to me that the "overflow" valve has never been brought up in any diag, or tests provided in the DC manuals, or per STAR center (we're talking the VP trucks here, I know full well the importance of this item on the P pump). I would think for the hoops they've had us jump through in diag on this fuel system the subject would have come up. Another thing is that when you replace the pump, a new "overflow" valve is not provided, which would lead me to believe that in all the VP's I've replaced over the years, I've never had an "enlightening experience" of having a comeback due to mis diag of a VP or drivability prob due to this "overflow" valve. Out of curiousity does anyone here know the exact function this piece has on the VP equipped trucks? In replacing the pump it looks like nothing more than a banjo bolt for the return feed, but to be honest I've never given it any thought, nor do I fully remove it from the line when doing a pump replacement.

Dr. Evil

I dont really know either...can only assume it functions like the OF valve on a 24V....Just something that came up on another forum so I thought Id mention it.

Id hate to think that a lot of the VP44's being replaced mave be simply bad overflow valves....??

It would be nice to get some more info on this....

scuzman00

Since I have had a 0216 code for over 50K miles and suffer the dead pedal syndrome, I wonder if this issue has some merit. If I can get a new overflow valve and place it into service I would be willing to report on whether it resolves a fix. It would kind of make sense that if the overflow valve is not returning enough fuel for a sensor to see that the VP is not getting enough fuel past it to properly lubricate, that a code could possibly be thrown, thus affecting other sensors that would cause other associated symptoms. Hopefully someone with an in depth Cummins parts list could chime in and give up the part # so I can test. I still find it really strange that when the dead pedal symptom occurs, that you can turn off ignition switch off/on and the problem COMPLETELY and INSTANTLY dissappears (at any speed or accelerator position).

Gary

J BODY

"No problems with this valve. It only serves to keep a little back pressure on the fuel flow to avoid cavitation. On the 12 valve it actually controlled the pressure."

Thats the info I got. Enjoy your new injection pump.

RCW

The timing failure code can be set by a failing pump, or by a dirty or failing crankshaft position sensor. Most often the crankshaft sensor will set a sensor circuit failure code, but not always.

When the overflow valve fails the system will not always set a code, but it can also cause any number of fuel pump related codes to register. It is easy to check, it is the extended banjo bolt in the front fuel line on the side of the VP, and if you can blow through the thing with your mouth it is history.

The DC guy is correct that it is never mentioned in diagnostic literature. It's purpose is to maintain uniform head pressure to the injection pump.

Dr. Evil

RCW,

Then, I would assume that the health of the overflow valve on a 24V is not as critical as it is on a 12V??

JAFAW

bet your timing problem is a worn brass sleeve in the housing for the advance piston