Dead pedal issues!!

[Mongoose]

Ok guys I've posted on Cummins forum but not much help. My vp went bad about 10 months ago I replaced it truck ran good.  2 moths later dead pedal started I bumped my fuel pressure up on airdog165 local shop had it way low. Truck ran good for 6 months. Dead pedal came back also had a low voltage to apps code changed apps with a timbo  and adjusted it per instructions. No more codexpensive but I still have the dead pedal. Spoke with local shop and changed ecm. Still have the dead pedal!!  For giggles I changed my fairly new filters and added 2 grounds along with changing terminals made it 2 and 1/2 months and dead pedal is back. Spoke with a few people including calling blue chips tech line and they think psg  is bad on pump.  My pump is under warranty so I pull it and warranty it out. Driving home tonight and the POS is still dead pedaling. I check alternator which is under a year old a/c voltage is  .028 at worst. Some one please help or I'm trading this thing in and getting a powerstroke! Thanks in advance

[Me78569]

do you have any way to read live data?  Edge juice? Quadzilla? Scn gauge?  

 

If so do you see the TPS reading drop off when it goes to dead pedal?  

 

Who is the pump through?  when you sent it in did they give you any indication that they fixed something?

 

what kind of fuel pressure?   

[Mongoose]

I bought the pump from a local shop who is bosch  certified. They rebuild in house. I drove tgere and they just handed me a pump and said bring back the other.  I have a quad. Tps stays where it should. I verified with the monitor and a snap-on scanner. Pressure is 18 cruising. 14-15 wot

Edited January 8, 2016 by Mongoose

[dripley]

Who is the local shop? There are not many places that can rebuild them.

[Mongoose]

Williams diesel  they are bosch certified. They took me for a tour of the facility before I bought the pump. Bosch test stand and all

[dripley]

What fuel pressure are you running? Idle and WOT. 

[Hawkez]

Sorry it this is a dumb question....

Is a dead pedal is just that? Push on the accelerator and there is no response?

[dripley]

In my experience, yes. Cruising down the road and the engine just falls off to idle.No matter what you do with the throttle the engine just idles. I think it gets mixed up with a  dead spot in the oe TPS where you loose throttle response in a certain range due to wear on the TPS. I am sure some body will correct me if I am wrong on that.

[Mopar1973Man]

Dead pedal is when it only idles.

Limited pedal is when you press it and you get some throttle but typically limited to a very low speed.

[JAG1]

31 minutes ago, dripley said:

What fuel pressure are you running? Idle and WOT. 

Dave, he says above that his F/P was too low for awhile and then got turned up to 18 psi.and WOT is 14-15.

I wish he did not have low F/P for awhile on a new VP.

[Mongoose]

The lower pressure was on the pump I just swapped. It still dead pedaled with new pump. I literally swapped pumps last night and drove it home. And it acted up on the way home 

Edited January 8, 2016 by Mongoose

[dripley]

4 minutes ago, JAG1 said:

Dave, he says above that his F/P was too low for awhile and then got turned up to 18 psi.and WOT is 14-15.

I wish he did not have low F/P for awhile on a new VP.

My eyes and my memory, no good!!

[JAG1]

Is your lift pump on a relay activated by the ECM and powered off the battery? 

[Mongoose]

I used the wire harness included with the air dog 165. It cycles with the key. And is controlled with ecm

[JAG1]

1 minute ago, dripley said:

My eyes and my memory, no good!!

 We can fix that with lots and lots of this.... .

I'm not an expert but is it possible this could be a fueling problem, i.e. bad tank vent, in tank screens clogged, or old in tank lift pump still in there?

[Mongoose]

I put a xdp. Sump on it and big line kit

[dripley]

3 minutes ago, JAG1 said:

 We can fix that with lots and lots of this.... .

That might be the problem, but if we can get everyone on board then everybody's eyes and memory, no good!!

 

[Mongoose]

I'm stumped. I am so confused. I shouldn't  have to change filters every 2 months. And I'm running the good cat filter with a Baldwin water seperator

[Me78569]

So when the dead pedal happens your quads TPS value does not drop?

[eddielee]

Curious, does it do this when it fires up or does it start after driven/ run a bit?

Try leaving the fuel cap loose and see if it has a vacuum at the tank which is stopping fuel leaving the tank.

Be sure to check the pressure when you have the dead pedal too.