Fuel pressure test

[stemo76]

been having some runnablity problems and want to test my fuel pressure at the end of the fuel rail. I found an article a while back that provided all the fitting types needed but now I can't find it.

Anybody know if I went to a hydrolic shop what I would need to ask for to screw into the head?

thanks.

early 99 7.3 PSD

[stemo76]

I removed the square headed plug and took it down to the shop and got a guage hooked up.

Question: I get 65psi before starting and stays there when running. I haven't been able to put a load on it with the guage since my valve covers are off and the boost tubes disconnects. Should the pressure fall down quick once the truck is turned off? isn't there a check valve at the input side of the fuel rail that should prevent this? Wondering if i have an injector that is not closing and leaking fuel.

This would explain my poor milage. I have only been getting about 10mpg, with reman injectors and adrenaline hpop pump and custom and stock tuning.

[jasonsthilaire]

[WHT00EX]

Here is a bump for ya my buddy is having the same problem I would like to figure it out also before I go and pull the injectors out of it.

[stemo76]

Well I found out that its normal for the fuel pressure to drop once the key is turned off. So I am in search for a compression tester.

Another thing I was told is that some early 99 powerstrokes computers didn't take to chips well and some have bought a newwer style computer and had better driveability. So I am going to try to find more about this.