Fuel pressure test - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 07-14-2009, 10:18 PM Thread Starter
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Fuel pressure test

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

Early 99 F-350 Crew DRW 4x4
Rosewood Stage 2 AB split shot injectors
Powerhungry custom tune
Adenaline HPOP
4" Banks with power Elbow
Fords Severe duty AIS (big disappointment)
Banks trans command
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post #2 of 5 Old 07-15-2009, 08:01 PM Thread Starter
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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.

Early 99 F-350 Crew DRW 4x4
Rosewood Stage 2 AB split shot injectors
Powerhungry custom tune
Adenaline HPOP
4" Banks with power Elbow
Fords Severe duty AIS (big disappointment)
Banks trans command
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post #3 of 5 Old 07-17-2009, 10:41 AM
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post #4 of 5 Old 07-20-2009, 07:28 AM
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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.

SUPER DUTY SPRINGS
33'S
GAUGES
AIH DELETE
6637 AIR FILTER
CCV MOD
DP TUNER F5
SWAMPS 175/146 SINGLE SHOTS
4" EXHAUST
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post #5 of 5 Old 07-20-2009, 07:02 PM Thread Starter
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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.

Early 99 F-350 Crew DRW 4x4
Rosewood Stage 2 AB split shot injectors
Powerhungry custom tune
Adenaline HPOP
4" Banks with power Elbow
Fords Severe duty AIS (big disappointment)
Banks trans command
stemo76 is offline  
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