I agree with Doc.........I might also add that 188k on a VP is past the average life

get the codes and report back eh

well i just got laid off from a mechanic job, but am still good friends with the owner of the shop, family actually, so i have free access to a snap on modis and a matco scanner all i have to do is show up, the problem is the truck is not in my hands yet, so there kind of tied, i told him the same thing about the guages, and hes thinking about it, but i have never hooked up a fuel pressure guage on a 24v, so ill need some help guys. is there any chance that the computer monitors the fuel pressure, bc like i said, i have free access to a MODIS, which shows all the factory pids?

nuttin will show ya fuel psi

sorry to hear of the job woes :ouch:

its ight, got lots of side work, since i was the only diesel mechanic at the shop, so now everyone is coming to me on the side, and thats unrecorded income that uncle sam doesnt know about.

so help me out here guys, how do i go about hooking up a fuel pressure guage to this thing?

Does it have a port on the Fuel Filter Cap ? if not theres a fitting on the VP44 to connect to

Keith - theres 2 places on a 99 to hook up a fuel pressure guage. 1) On the VP-44 Test port (not recommended in my book), or 2) on the fuel filter housing (the port is 1/8" NPT). You can use 1/8" DOT approved air brake line for tubing.


Hookup on fuel filter housing #1 (use the front middle port as this is post filter):

Attachment 55560

Hookup on fuel filter housing #2:

Attachment 55561

Alternate hookup on VP-44 test port:

Attachment 55562


You MUST have a needle valve (or pressure snubber) to dampen the pulses from the VP-44. Before starting the truck close the needle valve all the way, start the truck and very slowly crack the needle vale and continue to open it until you get a smooth reading. It should be just barely cracked. Thats all there is to it.

where is the easiest and cheapest place to get everything i need for this setup?

One of our sponsors should be able to hook you up but many of them will want to sell you an isolator setup with really adds to the cost.

The toughest thing to get is the needle valve and the fittings. Often, you can find this stuff at a local hardware or automotive store.