I have an 89 E350 with the 460 7.5 in an RV with 29000 miles on it. On this trip I have had all kinds of minor issues. MAP sensor fuel relay, ECC relay fan clutch. I thought I was good to go but now I have what I be leave to be a stuck injector on cylinder 5. I know its that cylinder as I have had a pure black plug, and I have gas coming out of that Cyl. between the head and the manifold. I'm not going to replace the gasket as my last 460 turned into me removing the engine to drill the broken bolts. I have the light blue top injectors that I be leave are the 24lbs ones from what I have read from all the posts about them. I was looking at the accel 150824 from summit and was wondering what others thought about them? I'm in the middle of my trip broke down in Ill. and need to get back up and running asap. I have already spent over 400 in repairs this trip and now this is going to hurt my funds so I need something cheap and quick. I even thought about going to a junk yard and seeing if they had any. Anyone know of any cheaper or am I just going to have to spend the 360 bucks?

 

do yo have a multi meter? check the resistance on all of the injectors while paying close attention to the one you think is leaking. If the coil is good in it, you might be able to clean the injectors.

I don't know if local parts stores carry rebuild kits..
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Rig up a 9 volt transistor battery to open and close the injector.. Rig up a spray can of carb cleaner and tubing to the top of the injector while using the battery is the simplest way to try to clean an injector in an emergency that I know of.. perhaps someone else knows a better way with out a shop.. You may be able to find a injector electrical socket at a parts store or junk yard. That would make it much easier to connect the battery. You don't what sparking close to the carb cleaner.

How long have you owned this RV? Before this trip, how long did it sit?

On the drivers door frame you should have a calibration code sticker. What is the number?
Should look something like this

 

I have owned the RV for about 4 years now. Drove from Florida to Arizona right after I bought it.29000 miles on it now. I have driven it weekly and then the past 6 months I have driven it daily. Never had an issue other than the fuel pump relay going out right after I bought it. At that time I couldn't find the relay locally so I changed it over to a standard relay setup from on electric fan. I did use a 30 amp relay and have not had any issue with it until right before my trip.it went out. Popped in a new one and was good to go. The calibration sticker shows 8-98A-R10. I haven't looked up anything on it so I don't know what it means. I will check the ohm readings on the ones I can reach but I cant reach #5 Cyl. as I would have to tear it all apart to get to it. I would much rather just replace them than rebuild them. Time wise I need it back together as soon as possible.. TY EDIT: It has been hard to start the past 2 months when hot. I have to use the emergency start button to give the starter the extra power to start.

 

You are correct: 24lb/hr @ 43.5 psi
I have very little experience with the 7.5 engine most of my experience is with the 5.0 and 5.8 On both of those engines you must remove the upper intake plenum to remove the injectors.. I am going to guess it is the same on the 460 but even less room to work! If #5 is your leaking injector then you are going to have to dissemble the upper half in order to get the injector out to replace it.
A couple of things to check. If you use connect a fuel pressure gauge and prime the system then it should hold somewhere around 40 PSI unless you have a leaking injector or bad valve in one of the pumps allowing the fuel pressure to flow backwards. A lot of people clamp off the fuel supply line after priming the system to eliminate the pressure leaking back through the pumps, which it should not..
If the coil is good in the injector then perhaps it has just built up some crud around the pental and can not close all of the way.. There is a cleaning method where you disable the fuel pumps by pulling the relay and connect a injector cleaner directly to the schrader valve. This is under pressure. You start the engine and run the pure injector cleaner through the fuel rail and injectors until the cleaner is gone and the engine stops. That might be a simple fix. The best fix is to replace them all but then you are going to have to do some work... If you have fuel leaking from the intake around the cylinder head then you also have a vacuum leak there. That can set everything off because now you have a lean cylinder. Also coolant runs through some of the passages so if the gasket is already weak then you might want to think about replacing the lower intake gaskets ASAP



Here is a list of the original ford part numbers used on your van I was able to come up with from your calibration code..