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Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 07-11-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
I would like to recap this thread and start a new...

I would like to recap this thread and start a new one.
Nov. 2016 truck died, codes indicated VP44 dead, replaced VP, put 80 or 90 miles on it.
April 26 truck died agin, will not start, no codes,...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 05-26-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
I put in a Fass DRP, did not fix my problem. But...

I put in a Fass DRP, did not fix my problem. But raised more questions.
When I get some answers I'll post them.
paul
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 05-08-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
Ref. post #13, read manual and it has some good...

Ref. post #13, read manual and it has some good info.
#1there are two power supplies for the lift pump out of the ECM.
One supplies (on my truck) 8.4 VDC when key is turned on.
and also during...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 05-01-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
Jerry, I am going to try to do the modification...

Jerry, I am going to try to do the modification with the pump where it is for now.
I have the failure of the cranking power side to the pump to overcome which I think your mod. will accomplish, I...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 04-30-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
Jerry, I finely got out the manual and I find...

Jerry, I finely got out the manual and I find there are two transfer power supplys feeding the lift pump circuit from the Engine Control Module, one is used during cranking the other is for running...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 04-30-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
Jerry, thanks for clarifying your hookup, when...

Jerry, thanks for clarifying your hookup, when you are feeding 12v to the lift pump you are not sending it up stream to the computer, I will do the same. I will put a V meeter on the pumps normal...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 04-30-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
oops! I forgot to mention there are NO TROUBLE...

oops! I forgot to mention there are NO TROUBLE CODES.
Max, I would think if there was fuel in the lines it would start, Like I mentioned there is no fuel pressure while cranking 3 or 4 sec. but as...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 04-29-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
Thanks Max, My original thread was for Thursday...

Thanks Max,
My original thread was for Thursday the 27th,
Today I tried to start the truck and it wouldn't fire at all. during the cranking sequence my fuel pressure didn't come up, when I quit...
Forum: Technical Info: 2nd Gen 24 VALVE DRIVETRAIN 04-29-2017
Replies: 26
Views: 2,623
Posted By LITEFOOT
Lift pump dying or power to?

In Feb. 2017 my VP44 failed "no start and the codes indicated VP44" so I replaced the pump, worked fine for approx. 150 miles.
On Wednesday the truck stalled as I was getting on freeway and died. I...
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