fuel pressure quastion

[Uncle Joe]

As advised on my earlier post (99 vs 01. 5 milage &performance) i checked my fuel presures. . i used an old a/c gage hose hooked to a hiese gage(a $7000 computerised presure reading device used for callibrating presure trsnsducers & such,it calibrated yearly to 1% of 1psi)anyway here are the results:

pre filter: idle 15. 00 psig 2500rpm 12. 75psig

post filter: idle 14. 75 psig 2500 rpm 11. 80psig

what do you think about those numbers???

with less than a 1 psi drop shuld i look @ the fuel filter??

what are the specs anyway??

uncle joe

 

[Evan A. Beck]

Are the stationary pressures, or did you do the test under load?

 

[Ramafid]

Anything above 10 psi at idle is OK according to Dodge. I prefer more than that. You need to test fuel pressure under load or you won't get an accurate reading. Hope this helps.

 

[EMDDIESEL]

Great, so ZERO psi under load is a nice sight to see

 

[Uncle Joe]

that was static... guess i will have to come up with a longer hose

 

[Shooter]

Originally posted by EMDDIESEL

Great, so ZERO psi under load is a nice sight to see

Only if you are a repair shop and the truck is out of warrany and on the back of a tow truck!!!!!!

 

[EMDDIESEL]

I am sure it would be for them!

 

[Rambling]

Does anyone have a manual or fact sheet that indicates what a minimum pressure value should be under what load and rpm?



My '99 maintenance manual doesn't have that information. Without it, I don't think there's any pressure data that I can give to a dealer that they'll accept indicating a failure other than being below 10 psig.



Only thing I found in my manual for a WOT condition was a vacuum test with no load. Are there any official numbers that one can hang their hat on?

 

[Uncle Joe]

Did a dynamic test yesterday:

climed a stiff hill from a stop @ wot the lowest i saw was 8. 6 psi for a slight second but the avarage is over 10 psi,how about it???

 

[LSMITH]

Sounds good Joe, 10 PSI at WOT under load is about as good as you can expect without modifying the fuel system. I got a good laugh at the longer hose crack too.