1294 case fuel problem long

ffreeb

Member
I have a Case 1294 a diesel engine and a CAV pump. I have replaced the mechanical fuel pump and the filters. I have siphoned the tank and only get clean fuel. I thought I had found the problem with it when I found where the fuel line connects to the tank loose. Today, with a full fuel tank, it quit like it ran out of fuel. It has quit twice in the same place after pulling a long hill. I loosened the bleeder on the filters and hand pumped the mechanical pump. I got fuel with no bubbles. I loosened the fitting on the line from the filters at the CAV pump and got fuel. I checked the bleed line where fuel flows back to the tank and there is a steady stream of fuel flowing while cranking. I loosened the bleed screws on the CAV pump and got a good flow from both when cranking. An hour later after it cooled off it started fine after I blead the lines at the injectors, even though bleeding them earlier made no difference. It then ran fine the rest of the day. I didn't put a heavy load on it the rest of the day though. It has Fram filters on it. I'm at my witts end with it and don't know what to do with it next. I'm tempted to pull the CAV pump and the injectors to have them tested.
 
You best check to see if you have the correct quad rings on the fuel filters. some take the quad ring, others do not. Hopefully Dieseltech will chime in and describe the differences
Loren.
 
Do you have something floating around in your fuel tank? The problem you describe I have seen debris in the tank cause this. Also your fuel cap has to breathe. You may be pulling a vacum in your tank and not know it. Check the easy things first before spending any money.
 
As already mentioned, loosen the cap next time it dies and listen closely for air rushing into the tank past the loosened cap, fuel will stop going out if air can't get in. Have not seen Fram filters lately, so I'm not sure if they have the same installation issues as NAPA/WIX filters do. On NAPA/WIX the filter top outer groove is the fuel inlet, and some guys make the common mistake of putting an O ring in that groove, restricting or shutting off the fuel completely. I've lost count how many times I've seen that done. I checked the parts list breakdown, and the fuel system does not have a constant bleed orifice like Perkins uses. Make sure all line connections are tight. When it's running OK, and shut down when hot will it re-start as it should, or does it need to cool down awhile? If that's what you have it's a sign the injection pump hydraulic head is getting worn enough to cause too much internal leakage, shows up first as hard starting hot.
 
Just wondering if the banjo bolt that connects the bleed off line from the filter to the injectors then to the tank has been replaced with the wrong banjo bolt... I think that banjo bolt should only have a very small hole in it, not the same size banjo as the rest in the fuel system. If the orifice is too large too much fuel get bled back to the tank resulting in lack of fuel to the pump.
 
I forgot to mention in my original post, I removed the fuel cap to check for it not venting properly.
 
An often overlooked problem on most of these DB's with a fuel problem is the pushrod that works the lift pump. Pull the pump and make sure it is flat on both ends not concaved. Have replaced many on the DB's in my neighborhood. Keep a couple on hand at all times as there are a lot around me.
 

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