I have a 1998 ctd, and am needing to check my fuel pressure. Where is the best spot to tap into to check this. My truck is hard to start when the motor warms up and also smokes at idle. I have a good idea what's happening but i wanna check my fuel pressure first. Thanks in advance.

 

There are two 1/8" pipe plugs on top of the fuel filter mount. The rearmost one is pre-filter pressure, the forwardmost one is post-filter pressure. Hence, you can also measure filter restriction. (max 5psi drop across filter.)

 

The easiest point to check after filter fuel pressure is the shraider valve on the VP44.

 

is it a 98 or a 98.5....12 valve or 24 valve

 

It's a 24 valve motor, hopefully i can get to checkin it in a day or two. Thanks for all ya'll's help.

 

I don't think they had a schrader valve until 2000.

In 98, both the 12 and 24 valve shared the same filter canister, with the pipe plugs on the top.

 

My '99 has the same filter canister, here's my gauge setup checking post filter pressure.

 

Just an FYI. I was spot checking my pressure for a while on mine. finally got my gauges in and the LP pressure was fine for an hour or so thrn went to 0, went back up to 13 back to 5 up to 14 down to 0

Just make sure you do a driving check on it

Chris