I have a F350 and it will not stay running. Runs good and then out of the blue it wont run correctly. I have had the tank off and cut it open and cleaned it good and had it professionally welded back together. Got diesel at the bowl, New few filter at the bowl and cleaned the ones in the tank. Ran it for 32 miles and then went back home and started out again and it would not run right. Just real bogged down. I have read the fuel pump test threads and just dont understand how to do it without the normal shrader valve. Any simple advice on how to do it would be greatly appreciated. I do have a diesel fuel pump tester from Harbor Freight. Just at a loss on what to check or do next. Any advice will be greatly appreciated.

 

#4orbX1/8fnpt to test fuel psi. Use grease gun hose to plumb to gauge
possible that the screens are closed in the tank. Checkout the Hutch mod
maybe the uvch is loose. Easy fix..50 cent mod

 

Thanks for the reply. I am sorry but can you explain a little more detailed on the fuel test and what I actually need?

 

There are 2 outlets on the back of the fuel bowl. The outlet on the drivers side is pre filter pressure and the one on the passenger side is post filter pressure. They have plugs in them that are #4 orb thread. Either one will work but post filter is what is going into the injectors. Most, myself included use this port. You will need an adapter to screw in to one of these ports that will accept 1/8 npt thread. You'll then a length of hose that you can screw a pressure gauge to. Grease gun whips have 1/8 npt thread on both ends so it makes a good hose that keeps you from having to track down a bunch of fittings. Find a 0-100 psi liquid gauge with 1/8 npt thread. Harbor freight, parts stores, etc will have them.

Put it all together and you have a gauge you can see fuel pressure with. One problem is that pressure at idle doesn't always tell you the full story. You can get a couple of adapters and make a longer hose so you can see pressure going down the road. Or if your keeping the truck get a fuel pressure gauge that mounts in the cab permanently. Then if you have a fuel pressure problem in the future maybe you'll see it in time to do something before it gets to a no run situation.

 

couple of videos for ya

 

Looks like you've already done a lot of fuel system work. Have you had the fuel bowl apart? If the center post isn't put back in correctly you could have pressure to the bowl but not out of it.