Melted Fuel Return Cap on Injector

[mwelliswa]

I have a 1988 Ford F350, 7.3l Dsl, where I noticed some fuel leaking from an injector fuel return cap. I pulled the fuel return cap and replace it and a day later it is leaking again. Upon close inspection, the cap appears melted and fuel is leaking through the side of the cap; obviously overheated. What would create only one injector (or fuel) to get this hot and melt the cap? Don't want to put a new one on until I find out what caused the problem. Any help or suggestions would be appreciated.

Thanks

[Mr_Roboto]

Bad news, your injector is probably sticking open a little, which allows the combustion gases to go up into the return cap.

Unfortunately, the combustion gases will carbon up the inside of the injector and it will get worse and worse.

[mwelliswa]

Thanks Mr. Roboto....Seems I should just go buy another and replace the whole unit.

[cdnsarguy]

You might as well change all the injectors if they are original painted grey or over 150K use. You will require a complete return line kit if you replace the set of injectors......

http://www.mwfi.com/Dieselpage.htm
http://www.dieselpage.com/

[ltl_jrw]

I had the same thing happen to my truck turns out to be a sticking injector letting the fuel pressure to go up thru the return line and blow a hole in the side of the return cap.

Jim