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OT cummins help

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pieceofjunk

11-09-2007 06:01:01

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I have a 93 Dodge 250 with a 12 valve cummins. I replaced an injector and now it will not start. I have tried to bleed it out numerous times, but it seems like it isnt getting much if any fuel through the injection lines. If I unhook all the lines from the injectors and crank it over I only see maybe a drop of fuel come out every once in a while. Do I still have air somewhere? What things should I check for?

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john hunt

11-10-2007 07:29:17

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Re: OT cummins help in reply to pieceofjunk, 11-09-2007 06:01:01

if you keep started it will start in about 4 to 8 hrs but if you get a few can of wd40 and start spraying on intake it will start .. keep doing that until it run by itself then adjust the timing " DON'T USE STARTED FUILD.... MIGHT BLOW THE HEAD GASKET OR BLOW THE BLOCK SEEN THAT BEEN THERE DONE THAT LOVE REPLACE THOSE MOTOR

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ZANE

11-09-2007 06:38:54

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Re: OT cummins help in reply to pieceofjunk, 11-09-2007 06:01:01

You have got to get all the air out of the pump.

If it has an electric lift pump it is probably wired in line with the oil pressure sender switch. Locate the oil pressure sender switch on the engine and if it has three wires coming to it it is probably with the electric lift pump. Remove the connector from the oil pump sender unit and place a jumper between two of the three conductors and listen for the pump to come on. The ignition switch may have to be on too. If you do find it to have an electric pump then open the bleeder on the fuel filter and the return line from the pump so that it can completely fill the pump. With the fuel lift pump running then open all the injector fittings at the injectors and crank.

If it doesn't have electric pump you can try introducing about five pounds of air pressure into the tank with the bleeders open. Don't apply more or you can burst the fuel tank.

Zane

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isu elvi

11-09-2007 06:21:26

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Re: OT cummins help in reply to pieceofjunk, 11-09-2007 06:01:01

I know it can take a while on the old cummins, they have a mechanical pump so you actually have to turn the motor over if i recall. On my 99 its electric, so its a little different. I would check to make sure your fuel pump isnt bad, with the new ulsd diesel, rubber components can deterioate quickly, and opening up the system can be just enough to make a border line part fail. This is especially true in pre-93 trucks, as they used natural rubber components, which liked the old diesel better. I know am not much help, but you can try www.dieseltruckresource.com or www.turbodieselregister.com, both are dodge only sites and offer a lot of knowledge. On our 92, we replaced injectors, and we just kept bumping it till it bled out, worked but took a while, and that was pre-ulsd fuel if that matters. Hope this helps.

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