Schrader Valve

[dusty]

I have been told that my starting problem, on my 2004 F450 Super Duty, could be no fuel pressure. I was told to check by releasing pressure at the schrader valve.

Is this the schrader valve?

[ATTACH]17503[/ATTACH]

[holsgo]

Attached link doesn't work.

[oldc6]

Dusty; Been seven years since i retired from dealership so, a little rusty on thsi stuff.

The black cap to the right side of picture on the chrome fuel rail is the pressure test schrader valve. the green cap one is for evaportive system test, which takes vapors from the fuel tank.

The red plastic line which appears to be broken is vaccum to the fuel pressure regulator . That is the round thing . it controls fuel pressure once engine is running.

i would assume your complaint is long crank times when starting. next start cycle the key on and off about five times and then start. that should build fuel pressure before cranking.

The most common problem with slow starts is the check valve in the intank fuel pump. replace fuel pump assy. big dollar deal........

that red line that appears broken is a critical thing because without vaccum to the pressure regulator you are running full pressure to system at all times. normally this only happens under full throttle accelerations. that broken line may have caused the check valve in the fuel pump to be broken because of to much pressure against it......

find a good tech, and he should be able to diagnois pretty quick........

[oldc6]

Just talked to the guys in the shop and they said some of the 5.8L v-8 models did have leaky injectors. they said it is quite rare though.
I am assume that yours is a v-10 model..........

[fredsheldon]

You can see where the red line broke off at the bottom of that component to the right and the impression where the red line had been laying across the wiring bundle. Now if that were on my sprinter you would be looking at $500 just for that little part most likely

[dusty]

[quote="oldc6"]Dusty]

The rig will not start at all. A shot of ether makes it sound like it is trying but then it quits firing. It turns over some but very briefly.

Some back ground:

This started while I was laid up with knee infections. Did not drive the rig at all but started it now and then. Then it became infested with pack rats. They contributed the broken vacuum lines.

I fought a battle with the pack rats and believe I have been victorious. Sorta. During those battle days came a day when I was running the engine and suddenly it stopped. It has not started since. It did not just sputter and quite. It stopped.

I originally thought bad fuel. Added good gas to the tank. Nada.

My wife and I are feeling well now and are in need of some travel. We lived on the road for four years and we yearn to get back out there. There are plans for the holidays -- the rig must get fixed -- even if I have to shell out money to get it running.

Your comment about the fuel pump..hmmm...when it was running with broken vacuum lines, it was not racing like full throttle. It seemed to idle properly until that day when it stopped to run no more.

Sounds like it is time to call the AAA wrecker. This shade tree mechanic may be in over my head.

Wish I knew if I had fuel pressure. That is why I was hunting the schrader valve. However, even now that I have found it, I am not sure I know what to do with it. I just assumed that releasing it would spray a little fuel. Now, knowing where it is at that may not be a good idea.

I'm looking for an old bicycle pump hose though - just a thought.

I love this forum and the accumulation of talent and information that it offers. I learn new things almost every day. I sure wish I had stated doing that when I was a youngster. I might have done something really worthwhile with myself.

[dusty]

Just talked to the guys in the shop and they said some of the 5.8L v-8 models did have leaky injectors. they said it is quite rare though.
I am assume that yours is a v-10 model..........

This is a 2004 E-450 Super Duty 6.0L V10.

[dusty]

You can see where the red line broke off at the bottom of that component to the right and the impression where the red line had been laying across the wiring bundle. Now if that were on my sprinter you would be looking at $500 just for that little part most likely

I fear that you may be right. This is not going to be a cheap fix. What you do not see in the photo is either two or three other vacuum lines that have been chewed through. The peripheral damage is probably going to be very significant.

[oldc6]

Dusty: got rained out on outside project. went to the shop to research some more.

that thing in upper right of picture is vapor management valve assy..
should have manifold vaccum to it and then is a tee down to pressure
regulator for fuel ... e-450 has it mounted at back of engine, the critters prefer that area for some reason...

this should not have made it not run at all. So, the critters may have chewed other wires and they have now broken..........

yes, if you remove the black cap and push down on the schrader valve (it looks just like one in a tire stem) it will spray fuel . if not you do not have pressure..

they may have chewed the wires off on top of the fuel tank that go to the pump...
you mentioned dirty fuel. did you change the filter??????????
\how did you get dirty fuel.?????????

( passing note........... do not order any shopsmsith stuff till you get this thing repaired............) take one bill at a time...........

around here we use the old green anti-freeze that is sweet tasteing in a small pan in the garage......any critters that drink that stuff will be dead within a few hours........ not legal to do it according to the animal people but, sure works... the new anti-frreeze all have a bittering agent so pets, etc. will not drink it......works reaLLY GOOD ON SKUNKS............

[dusty]

Dusty: got rained out on outside project. went to the shop to research some more.

that thing in upper right of picture is vapor management valve assy..
should have manifold vaccum to it and then is a tee down to pressure
regulator for fuel ... e-450 has it mounted at back of engine, the critters prefer that area for some reason...

this should not have made it not run at all. So, the critters may have chewed other wires and they have now broken..........

yes, if you remove the black cap and push down on the schrader valve (it looks just like one in a tire stem) it will spray fuel . if not you do not have pressure..

they may have chewed the wires off on top of the fuel tank that go to the pump...
you mentioned dirty fuel. did you change the filter??????????
\how did you get dirty fuel.?????????

( passing note........... do not order any shopsmsith stuff till you get this thing repaired............) take one bill at a time...........

around here we use the old green anti-freeze that is sweet tasteing in a small pan in the garage......any critters that drink that stuff will be dead within a few hours........ not legal to do it according to the animal people but, sure works... the new anti-frreeze all have a bittering agent so pets, etc. will not drink it......works reaLLY GOOD ON SKUNKS............

I believe the critters have limited their destruction to the area on top of the engine (between the fuel rails). In fact, the only damage that I have seen has been the vacuum lines.

I suspected fuel because the rig sat idle for an extended period of time. I added fuel earlier (months ago) in an effort to get it started.

I hear your warning. At least I thing it was a warning that this may be an expensive job.

I have not changed the filter. I can not find it. I was hoping that a test at the schrader valve would indicate pressure and I would not have to.