Engine/Transmission (1998.5 - 2002) 13psi lift pressure(idle)......p216 code

[PSpychalski]

Reading posts on the VP-44 failure associated with lift pump failure. I have 13psi @idle and 9psi WOT. Truck stumbles from 0-10 mph,cold, no problem when she gets to ops temp. Checked codes and am showing p216 code & p1693. Any thoughts? Is my Injector pump going South even though I have good lift press?



Ski

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2002 5. 9 HO Stock no bells and whistles

 

[wtfd6]

my vp went bad with no lift pump problems. but i changed them both anyway. mine started when it got cold. when cruising on the highway, does your engine sound like the load is changing. my truck started getting dead pedal. at first it was when i tried to accelerate from a dead stop. then like turning on a switch, the truck would take off like a rocket. then, it would just happen going down the road. progressively it started happening more and more. hope this helps.


mark

 

[BradyWilliams]

Those two codes can be set by the diaphram leaking but they can also be set by air in the fuel supply system. But also they can be set by a bad pump housing. The advance housing bore is steel on the updated ones but if you have a brass advance bore housing then the advance piston will stick and set those codes. Also if you have got some water or dirt in your pump then that will set the same codes. It is likley that you need a VP44 injection pump. Thanks, Brady 1-800-955-0476

 

[PSpychalski]

The symptoms wtfd6 had describes mine to a "T". Guess I need to call the dealer. Good thing I'm still under warrantee

 

[wtfd6]

i wish mine had been under warranty. it was a couple months out of warranty when it finally got real bad. it wasnt the first vp to go bad on my truck. the one i took off said reman in ck. so i know it had been replaced at least once.


mark

 

[PSpychalski]

Finally got my truck to the dealer. Called a bit ago. Said my lift pump was good, but injector pump shelled itself. Putting in a new pusher pump in the fuel tank and doing away with the lift pump. Thank goodnes its still under warranty. Being in Alaska... they are also doing a cold weather software update. Should run much better. Thanks to those that responded and those reading the posts.

 

[PSpychalski]

Truck is running great. New pusher pump in tank. Dealer warranty job when replacing the VP. Pusher pump gives me 9psi/idle and 3psi/wot... a bit different numbers than the lift pump gave me. Higher volume pump if I understood the dealer.

 

[rweis]

Brett -



Those two codes can be set by the diaphram leaking but they can also be set by air in the fuel supply system. But also they can be set by a bad pump housing. The advance housing bore is steel on the updated ones but if you have a brass advance bore housing then the advance piston will stick and set those codes. Also if you have got some water or dirt in your pump then that will set the same codes. It is likley that you need a VP44 injection pump.



Thanks for posting. Your insight and explanation are REALLY GOOD! Helps me understand how this VP works.



How would you get the dirt / water OUT of the VP? Does the Overflow valve help in keeping the air out (throttle bore)?



Bob Weis

 

[chazj]

Truck is running great. New pusher pump in tank. Dealer warranty job when replacing the VP. Pusher pump gives me 9psi/idle and 3psi/wot... a bit different numbers than the lift pump gave me. Higher volume pump if I understood the dealer.

Ski: I had the same upgrade with fuel pump in tank: 4lbs idle and ZERO lbs with any kind of "heavy" throttle. DC's response about not worrying about PSI anymore but rather concentrate on volume is also identical.



For what it's worth, after reading many threads here, the lack of pressure at the VP44 may still be an issue with respects to the latter's longevity.

Something to kind fo keep in the back of your mind.



If there is any new information on the subject (on a positive side) I hope to read it quickly as I am about 300 miles before I am out of warrenty... :--)

 

[sardoghauler]

I'm no rocket scientist

Can someone 'splane thie to me. DC says volume not pressure is the issue with lp's. However, if the fuel line is still the same size wouln't lower pressure dictate lower volume? I don't get it.