Hey guys, Nate a new member to the Ford world here. I have a new project. A 1999 29 foot RV on a E-450 chassis (6.8l) with 11,000 miles. That has been sitting for ten years.

First I changes the battery, oil & filter, air filter, and coolant. The vehicle started and I bleed the coolant lines for 20 minutes and shut it down. All was OK...

The next day I went to start it and now it cranks but wont fire up. I tested the fuel pump and it primes. Also checked the Fuel pump shut off switch. I changed the fuel filter just in case. I figured that I should change it any way (gas in filter looked good and clean). Also, I have fuel to the valve (looks like an air stem for a tire) rail. (sorry for the poor wording). Also I pulled the two spark plugs, the first two on each column closest to the cab and both tested OK. Both fuse box contents are all check out and I moved relays and all are OK as well. I would find it hard to believe that all 10 injectors clogged after being ran for 20 minutes. What am I missing?

I'm stumped!

 

You need to check the actual fuel pressure at that Schrader valve (tire valve) on the fuel rail. What I do is find a fuel pressure gauge, remove that Scrader valve with a valve stem removal tool (I have one left from my bicycle days) and just hose-clamp a piece of fuel hose to the valve on the fuel rail.

Turn the engine key ON a few times while watching that fuel gauge. Should get to 28-30 lbs pretty quick. If it doesn't, you might have a piece of crud in the fuel pressure regulator.

Oh, and WELCOME TO FTE!

 

You need to check the actual fuel pressure at that Schrader valve (tire valve) on the fuel rail. What I do is find a fuel pressure gauge, remove that Scrader valve with a valve stem removal tool (I have one left from my bicycle days) and just hose-clamp a piece of fuel hose to the valve on the fuel rail.

Turn the engine key ON a few times while watching that fuel gauge. Should get to 28-30 lbs pretty quick. If it doesn't, you might have a piece of crud in the fuel pressure regulator.

 

I wonder maybe the connector to the CPS have gotten loose?

 

I would try and start it again but this time step of the gas just a little and see if it starts. If it does and it stops when you let off the automatic idle control is bad or stuck.

Denny

 

I hope it is as easy as this! Where is this located under the hood? I know on the 7.3l its right in the front of the motor.

For some reason I have a feeling it is something small like this.

 

Thanks! I didn't know that I could disconnect the valve. Looks like I have a few things to test this weekend!

 

It's located on the front of the motor on the driver's side just below the valve cover.

 

Sorry for the update delay, I had a intense summer semester at the school. I ended up draining all the fuel and about 13 gallons came out. I refilled about 18 gallons and got it started which is great and a real milestone but it still does not run real great. I can get it to idle and let it ran for about 7-8 hours to run some fuel through. When I press the gas normally It wants to bog out and die. I can lightly press the accelerator and work it up to a good rev. Also, I threw a code saying "system running lean bank 2" Today I did what Krewat said and did a fuel pressure test and only reached 10PSI. I changed the Fuel pressure regulator with little success. but I do think it does start a bit better with the new FPR. I didn't think It was a fuel pump issue because It primed but Its the only thing I can think of at this point...

I feel like i am all most on the road! thanks for all the help.

 

I've had a very similar situation with my old 94 pickup. The fuel pump still worked but it was weak, so the low pressure caused hesitation, and bogging when I put my foot into it, like when merging into traffic. I'll bet if you change your fuel pump, you'll be good to go.