busted

can someone tell me what the wires going to the fuel pump on my 95 do. was looking at them and thay were burnt of at the plug on the pump and one other wire was burnt but don"t know were that one goes. looks like it goes up two what i can"t see. thanks for any help on this.

infidel

It's your fuel heater, not the pump.
You need Cummins part number 3843722-S - cable harness, about $50

busted

thanks got the part number and will get one this week.

busted

forgot to ask do i need a new fuel heater?

waldersha

Probably not. Usually the wires that are burned are the ones going to the top. Those are for the thermostat, and it comes with the part number Bill mentioned. Couple of screws (allen head) and you're back in business.

busted

ok thanks guys. got under truck and was hoping i wouldn"t have to replace it.

kd460

But why did the wires cook? Just curious, KD

busted

i have no clue. was hoping smeone on here mite know or have heard of this happening. im thinking i should just get a new one to be safe. and if anyone has replaced one could give me a little help or what thay did. i see it not to easy to get at. thanks

infidel

It's quite common.
My feeling is Dodge skimped on the wire size.

busted

do you think a new fuel heater would be a good start and new wires or just new wires. don"t want to spend 50 on wires and have them go in a week. and who would have the best price on a fuel heater? thanks

infidel

Complete heater is close to $300 and last I heard is on national back order.
You probably couldn't get one even if you wanted.
All the parts for the heater are availible separately, there's only four.
heater element upper quad ring 3834185-s
heater strainer kit 3845400-s
heater element 3907766-s
cable harness 3843722-s

busted

thanks for part numbers think i"ll just do a rebuild on it. now how hard is it to get out?any help here would be great. thanks

kd460

http://dieselram.com/ubb/ultimatebb....;f=45;t=000007

http://dieselram.com/ubb/ultimatebb....;f=45;t=000006

Those links may help or at least give you a better understanding of things.

I find access is best from under the truck. Get it on ramps for needed elbow room. If I remeber correctly, a long ratchet extension comes in handy.

Also the replacement heater element (if you need one) is a little different from the original. It appears to be made for "multi-model" fitment. The instructions suck (I have a copy if you need it). The actual heat element on our trucks gets installed UPSIDE DOWN! The instructions do not tell you that. You also need to buy the rubber gasket, it does not come with the kit (only one does, you need two, can't remember which one or if you feel lucky, reuse old one).

Personally, I would replace the thermo, take the heater assembly apart, clean the prefilter screen, take alook at the heater element contacts (like in the link I provided), and run a meter accross the terminals of the heater element to see if it is good. KD

busted

thanks kd for the link. big help.