How To Diagnose Bad Ip

[Truckie117]

Hi
I had a surging problem at about 45 mph and dont know if it is a tranny problem or a bad Ip.
Here is a link to data I scaned with a carcode scanner.
What is the test to find out if the IP is going south about 150K on pump.
Posted original problem in the drive train section.
http://mysite.verizon.net/vze7ye05/
Thanks
Truckie117

[More Power]

Have you changed the fuel filter? Tested for lift pump pressure?

Jim

[Shikaroka]

Have you changed the fuel filter? Tested for lift pump pressure?

Jim

I don't mean to highjack his thread, but... what is the lift pump pressure supposed to be? I installed a gauge in the hose running to the drain valve, but it seems awful low to me.

[JohnC]

...what is the lift pump pressure supposed to be?

On an EFI engine, anything above zero is fine. The lift pump only supplies fuel to the injection pump. All pressures are determined by the injection pump. As long as the inlet is not under a vacuum, the pump is supplying adequate fuel.

[Truckie117]

Ok I now have disassembled the beast got a new IP , injectors, glow plugs and PMD the updated one. I have cleaned up every thing removed and reinstalled my leaky valve conver with the "right Stuff" and started reassembly. Youtube video here.
http://www.youtube.com/watch?v=bcedI2q8_3U
http://www.youtube.com/watch?v=JsAFbaZWYfI
http://www.youtube.com/watch?v=9d-SGyzL84Y
http://www.youtube.com/watch?v=dRfOPUVVY8E
http://www.youtube.com/watch?v=sfagqI39vwY
Hope I did this right. any pointers on where all the wires connect would be appreciated.