what is the fuel pressure supposed to be at? mines about 65 psi while running, also is the pressure supposed to stay at that when the trucks totally off? or will it drop some? I think mine said 40 psi when off, is that normal?

 

bill (04lvl2) and i have tested this before. it was 65 when truck is running, and its suppost to stay pressureized for a little bit when u turn ur truck off. his truck did, and mine droped to like 20psi very quick. i had to change my fuel pump and that solved the problem

 

40 PSI doesn't sound bad. It should hit some pressure and hold, or there are leaks -- but it can be below 65. Is it steady at 40?

Also, the very process of putting a gauge on it drops the pressure slightly. The more you do it, the more it drops.

 

Yeah i did notice that about it dropping every time, Well when its running its at 65 psi and when its off key off and all it is about steady 40 psi, forgot to try it with the key on... not sure if that makes a diff. I would assume so since it engages the pump.

 

is ur truck giving you anykind of symptoms that made you check ur fuel pressure, or did u just decide to test it one day? if ur truck is running good, dont worry bout it.

 

yeah # 3 is misfiring, coed was 303 or something like that I beleive, spark is good, so I'm thinking my #3 injector is clogged or something, I took it out to look at it, blew some compressed air in it and stuck it back in, seem to run fine for about 30 sec. and went back to misfiring, so, maybe I should check the compression also?

 

did you check the plug wire? perhaps your distributer cap (if the 3.0ls) have them, has some carb tracking making it misfire. How many miles on the motor?

 

You may have an injector issue but fuel pressure is not your problem. If there was a fuel pressure issue it would affect all of your cylinders not just one.

 

Yeah thats kind of what I was thinking, seem slike my fuel pressure is ok.

 

Well the plugs and wires are brand new thaose were the 1st things I changed when it through the code, mine does not have the dist. cap, just the coil pack I believe its called. Truck has 102,xxx miles on it now, never had any problems with it until now so its been a good little truck, never changed the fuel filter or anything, just plugs and wires every now and than. What do you all think? I'm leaning towards the faulty injector....

 

102,xxx and never changed the fuel filter? wow. i would change that...its gotta be pretty cloged. its recc. every 30k

i would run a compression test on the cyclinder.

 

really? every 30 k? wow thats crazy .. Ill have to do that, where is a good place to grab one? also I will do a comp test.