Join Date: Nov 2008
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Quick way to check fuel pressure F250 1999 7.3
I have a 1999 7.3 Powerstroke F250. I'm not a super experienced diesel guy, so I'm not claiming that this is the best way to check fuel pressure, but it worked for me so I thought i would share it.
I didn't want to cut into my fuel system so I connected a hose -- the blue hose in the pictures -- (about 3 foot of 3/8 high pressure hose) to the fuel filter purge tube. The purge tube can be found by looking behind passenger front tire, you can see a tube that just hangs down. When you flip the yellow switch behind the fuel filter assembly, the fuel dumps down this tube.
First of all, having a hose there is a good idea so you can catch fuel when you purge the bowl. Second, it is a handy place to check pressure.
So I went to Home Depot and got a pressure gauge for 8 bucks, a couple of brass fittings to adapt to 3/8 hose, and some hose clamps. Also I used the goop that you put on these connections to keep them air tight -- I think it's called thread sealant.
I turned on the truck with this assembly all hooked up, and when I was ready I opened the purge valve on the fuel filter assembly. At first there was no pressure reading but over the next minute or so I watched it climb to 60 PSI. I suspect that the pressure was negligible at the beginning because there was air in the lines and it took a few secs to build up the pressure and spread it out.
When I was done I left the hose connected for future use, but i used zip ties to keep it out of the way.
Hope this helps.