priming diesel engine

[maddog]

Hey again folks, you all helped me with my case 1840 messed up fuel line. Now I have another issue I replaced some filters and believe I have air in the lines, is there any way to prime/bleed the pump? I have primed other diesels with the manual primer but I don't see one on this machine . Thanks agian for all the help, hopefully some day I can repay the advice/help.

 

[willie59]

Does it have item #1 lift pump? If so, it should have a manual priming lever on it. Just have to roll the engine over until lift pump isn't resting on a high cam lobe so manual priming lever will pump fuel.

Item #19 is a banjo bolt on outlet of fuel filter base, item #20 is a 10mm head bleeder screw in banjo bolt. Open bleeder screw, operate manual priming lever until you get good fuel flow, close bleeder screw, pump manual lever a few more strokes to pressurize system, then try starting your engine.

 

[maddog]

Atcoequip; If I didn't know any better I'd say I think you know your stuff thanks yet again. I was looking in the wrong place completely, I did notice the lever on the pump and never put 2 and 2 together, I feel like an idiot. Not sure when I'll get a chance to work on it{later today or tomorrow} but will let ya know what happened once I try. Thanks again, part of my issue when working on this is the fact that there is no room and it is hard to even see componets let alone get to them. Thanks again

 

[willie59]

Yep, not easy to get to that stuff with the cab in the way, just about have to have the cab slid forward to do any real work in there. But you can get to these components with the cab in the way. A little difficult, but can do.

 

[truecut]

We have a 2000 bobcat 873 with a deutz motor. After replacing the heater and wiper fuse and replacing the fuel filter the bobcat will turn over but not start. We did not prime it after replacing the fuel filter and could only find one filter to replace. Also, does anyone have a diagram of the deutz motor and troubleshooting guide for the bobcat? Thank you so much!

 

[willie59]

Welcome to the forum truecut. :usa

Well, did you replace the fuel filter because it was time to...or because the engine quit running and you thought it might be caused by the fuel filter?

You should have only one spin on fuel filter on that machine, located near bottom of engine and visible when you open rear door. There should also be a rubber primer bulb in the fuel supply line nearby the filter, somewhere around bottom of engine oil pan. There is a bleeded screw located on top of the fuel filter housing. Open the bleeded screw, squeeze primer bulb in fuel line and fill filter with fuel. When fuel starts coming out of bleeder screw, close the bleeder. Squeeze the primer bulb a few more times until it gets some firmness to it and try cranking your engine.

 

[truecut]

Thank you for welcoming us. We did try the above but it isn't working. We can't get fuel to the primer pump.

 

[truecut]

BTW it has fuel. Could it be a frozen line? When air is blown into the line we can't hear anything.

 

[willie59]

Thank you for welcoming us. We did try the above but it isn't working. We can't get fuel to the primer pump.

You're not giving enough info in your posts truecut, meaning, we have to "read into" what you're experiencing.

If you're saying you opened the bleeder screw on top of filter housing, pumped the primer bulb, and can't get any fuel flow. Then you either have a failed primer bulb, a hole in fuel line, or something blocking the supply line from the tank.

A failed primer bulb or hole in fuel line would cause the primer bulb to simply compress and expand continuously and not move fuel. Something blocking the fuel supply line would cause the primer bulb to compress, and it would stay that way, flat, because it would be putting a vacuum on the blocked supply line.

 

[willie59]

Ok, I notice you posted again while I was typing response.

Yes, could be water frozen in supply line. If temps are low, very possible.

If you blew compressed air into the supply line from tank, you may have compounded your problem. It's not good to blow air in the supply line on a Bobcat because they use a check valve at the end of the line in the bottom of the tank. Pressurizing the supply line can possibly blow the pick up line off inside the tank on a Bobcat

 

[truecut]

Thank you Atcoequip. We really appreciate your help. Would you happen to know where we could get a diagram of the deutz motor and a troubleshooting guide for reference?

 

[willie59]

I don't have any diagrams on your machine, but your fuel problem is really not complicated. If you're not getting any fuel out of the primer bulb, you're just going to have to go backwards to the tank and find your problem. I've seen fuel lines mashed, holes rubbed in them from vibration, pick up tubes broke off inside tank, etc. Just have to go through your supply lines.

 

[toomanymachines]

I find it works very well on any type of machine to open up the bleeders and us a blow gun to pressureize the fuel tank. stuff a rag into the filler and slowly add a little air at a time. the air will push up the fuel through the lines into the filters and through the pump. done this with success in trucks, tractors, skidsteers, etc. I even prime carbs in a sled this way. better than pulling a big sled over 20 times.

 

[astars88]

Hi there, i think i'm having the same issue with the pick-up tube/filter needing replaced. My question is what steps do i take to remove and install the pick-up tube. I have a 1999 873 bobcat. I have located the elbow going into the tank, but seems to be in a difficult place to work on, under the hydro-pump. Some tips to getting that snout changed would be great

 

[willie59]

Welcome to the forum astars88. :usa

There's one model Bobcat, might be yours, that the pickup is in a tight spot directly below the drive pumps. What a PITA!

Not easy to do, requires much patience and more swear words. No reals tricks or tricks on those, very difficult to get a hold of. Can't remember if I gripped the elbow with long nose vise grips or if I simply used two long screwdrivers to pluck the elbow out of the tank. Getting the new parts back in isn't much easier.

Will say this though, since you're going to Bobcat for new pickup tube and strainer check valve to go on the end of the tube, don't forget to get a new rubber grommet that the elbow fits into. Also, be sure and pull the pickup elbow out before you make a trip to Bobcat, there's always the chance you'll damage or break the elbow and need a new one.

Once you get your parts, fit the check valve on end of hose. Lubricate hole in grommet with Petroleum Jelly and slip it on opposite end of hose, slip it about an inch onto hose. Now fit the elbow on end of hose. Lubricate the hose between grommet and elbow, and lube the outside of grommet.

Slip the hose into the hole in top of tank. Press the grommet into hole in tank, then press the elbow barb into the grommet. That's pretty much the method, but on your machine this all sounds easier than what it really is.

BTW, be sure you have identified the pickup elbow and not the return line elbow as they both fit into the top of the tank.

 

[astars88]

Hey just wanted to thank y'all for the help and info. I change the pickup tube and fuel-line, she fired right up. $26 at Bobcat, kind of cheap to fix a dead-cat. Ran it for 1/2hour and got stuck in a electrical ditch, cause of the frozen ground. Ha, took two hours to get out. I think i was over excited she was fixed.

 

[willie59]

Well, glad to hear you got it going astars88...even though you proceeded to drive it off the proverbial cliff. :tong

Welcome to the forum.

 

[Nac]

I have a Lull 1044B with a John Deere motor. I lose prime once and a while and have to crakc the fuel filter bleeder and prime it with the manual lift pump. Can I by pass the Manual lift pump and install a nre fuel filter witha built in manual or electric primer pump?