763 Bobcat Fuel Pressure

yosemite917 · Sep 5, 2007

Have a 763 Bobcat with 2250 hours ran great until today. While transporting a bucket of topsoil down my driveway the motor just slowly stopped. It seemed as if it were out of fuel. The needle was low but not empty. Added some diesel, squeezed the primer bulb and I was back in business for about 200 yards!! Then, exactly the same thing happened. Now I know there is fuel in there but what I did notice is that the primer bulb was not hard as it should be? Again, I squeezed the bulb started the bobcat it worked fine for only a short period of time?? What gives?? Any ideas out there? Could it possibly be the fuel filter?? Please help this Newbie!!:beatsme :beatsme :beatsme

Thanks in advance

Yosemite917

Countryboy · Sep 5, 2007

Welcome to HEF yosemite917! :drinkup

yosemite917 · Sep 6, 2007

Hello Out There

Any suggestions anybody?????

:beatsme :beatsme :beatsme :beatsme :beatsme :usa :usa

Yosemite917

Lashlander · Sep 6, 2007

I don't have a bobcat but it sounds like you have a restriction in the fuel line on the suction side of the pump. I say this because you said the bulb was not hard. There could be a screen in the tank that has picked up enough junk out of the tank to restrict it. I think I would start with new filters first though. I guess it depends on how long its been since you changed them. See if you can blow back into the tank. If a screen is restricted that will clean it off. It could also be the primer pump is worn out. I'm not sure I ever saw one go bad with that many hours though. Good luck, sometime these little bugs can be hard to find.

Electra_Glide · Sep 6, 2007

yosemite917 said:
Could it possibly be the fuel filter?? Please help this Newbie!!:beatsme :beatsme :beatsme

Thanks in advance

Yosemite917

That's the first thing I would check. The next thing would be the pickup in the tank.

Joe

yosemite917 · Sep 7, 2007

Thanks!!!!!!!everyone!!!fixed!!!

Hey guys,

Right on the money ......... it was the fuel filter!!! Running like a XXXXX XXXX.

Yosemite917:usa :usa :usa :drinkup :drinkup :drinkup

gypsycatfish · Nov 6, 2007

I have a new used bob cat 873 Turbo with the Deutz engine. If it sits for a few days it may not start even after trying several times. Other days it starts at a touch and will continue to start fine if you do not let it sit for several days. The filter is clean. It has 4 separate injector pumps and the fuel valve has a solinoid that pulls the cam over to run the injector pumps. It is almost like it is losing it's prime. I do not think the fuel valve would come and go unless there is a bad electrical connection. I have squeezed the prime bulb, no luck. Maybe something is in the tank and I will check tomorrow but if the machine is not moved I do not see understand what changes from time to time unless it is electrical, but do not understand why the sitting for 3 or 4 days makes it not start. If you start it every day it will not fail.The machine has 1800 hours on it. Anyone else have this problem

xkvator · Nov 8, 2007

Lashlander said:
See if you can blow back into the tank. If a screen is restricted that will clean it off.

DO NOT do that on Bobcat equipment...

there is a check valve/screen on the end of the fuel pickup hose...you could just blow it off.

the screen is only 1/2" dia. x 1" long...not much surface area...

if you don't already have a filter on your tank pump,put one on...and if you use fuel cans, make sure they're clean...

Fishfiles · Nov 9, 2007

pick up tube

Bobcat has got away from the screen in the tank on the pickup tube that they use to use , they also changed their pickup tube from a soft clear plastic hose to a hard plastic --------the old style tubing would rot off and fall into the tank , it would leave a piece , say , 1 1/2 inches long , if the tank were full it would run for about 1/2 hour then run out of fuel-----after u[grading to the newer style pickup , I have seen the old tube in the tank continue to rot and break into little pieces that get sucked up into the pickup and clog at the steel 90 degree fitting at the top the tank , usully when this happens the bulb will suck closed when the engine is running

bobcatmechanic · Mar 27, 2008

the 873 duetz check to make sure the head gasket and the timing belt are good easy way to check the head gasket is to look at the back of the engine if its covered in oil good chance it needs a head gasket same goes with if it blue smokes at all timing belt is good to change 3000hrs or 3 years which ever comes first when the break they tend to bend puch rods and get everything outa wack

tdburnette · Sep 7, 2008

good information
thank you,

Josh2002cc · Sep 16, 2008

Fishfiles said:
Bobcat has got away from the screen in the tank on the pickup tube that they use to use , they also changed their pickup tube from a soft clear plastic hose to a hard plastic --------the old style tubing would rot off and fall into the tank , it would leave a piece , say , 1 1/2 inches long , if the tank were full it would run for about 1/2 hour then run out of fuel-----after u[grading to the newer style pickup , I have seen the old tube in the tank continue to rot and break into little pieces that get sucked up into the pickup and clog at the steel 90 degree fitting at the top the tank , usully when this happens the bulb will suck closed when the engine is running

I am sorry but maybe you are mistaken, Bobcat still uses and supplies the screen and soft rubber line for fuel pickup within the tank. Part number on the screen is a 6650239, the fuel pickup tube(soft/clear) is 6569752 which is bulk(cut to length), the clamps you use are 6661213 x2, and the bushing you replace at the top of the tank is 6553411(for $1.00 I see no reason not to change it)

Now onto a few of the 800 series(853,863,864,873 and T200), they can use a 6579554 which is still a clear soft rubber pickup tube but is cut to length. You still use the above mentioned screen and clamps.

BILL2009 · Mar 20, 2009

Getting to fuel intake on 853

Greetings everyone. I have had my 853 quite a few years ...without a problem.....I don't use it that much...I narrowed my problem to the intake tube and screen rotting away and breaking off into my tank .My 853 runs when tank is full. When it reaches 3/4 full it dies out..when I top of the tank it runs well again.Manual says I have to pull engine out to get to the intake hose....Can anyone tell me if there is another way to get to the intake hose for replacement..and should I try to get out the old rotted pieses of hose out of bottom of tank. Any help would be highly appreciated

willie59 · Mar 20, 2009

BILL2009 said:
Greetings everyone. I have had my 853 quite a few years ...without a problem.....I don't use it that much...I narrowed my problem to the intake tube and screen rotting away and breaking off into my tank .My 853 runs when tank is full. When it reaches 3/4 full it dies out..when I top of the tank it runs well again.Manual says I have to pull engine out to get to the intake hose....Can anyone tell me if there is another way to get to the intake hose for replacement..and should I try to get out the old rotted pieses of hose out of bottom of tank. Any help would be highly appreciated

I haven't worked on an 853, so I'm not sure. I think this was one of the early machines where Bobcat started putting fuel tank under engine/pump assembly. Although I'm not familiar with the machine, I'd be surprised if you "have to remove engine" to replace the p-u tube. I will say this; I don't remember the machine models, but I have worked on some Bobcat's that the p-u tube was a PITA to replace. One I worked on it was directly beneath the drive pump, took a lot of cussin' and counting to ten to replace it. Raise the cab and have some one at rear of machine pull on fuel hose so you can tell where it goes. You have to find where the fuel p-u fitting is to determine if the job can be done without pulling engine.

bobcatmechanic · Mar 21, 2009

its a mother ****** its directly under the hydorstat right in the middle of the machine good luck is all i have to say prybars and lots of petroleum gelly are your friend on that one pull the old one put the new one on and put the tube in the tank then put the gromet down in there then snake the rest of the fuel line in and use a pry bar to shove the 90 degree fitting back in i know of a few people that can do it in about 10 to 15 min out and back in shortest time i have so far is a half hour longest about 3 u will see what i am talking about when you get in there

TALLRICK · Mar 21, 2009

Anyone who can replace that thing without removing a bunch of parts must be one hell of a mechanic. On mine I removed the plastic fragments and brazed on a nice copper line and screen in place of the plastic factory garbage. With the location of that fuel tank I never want to have to replace that pickup tube again. Even painted the machine before sticking the tank back in. In the past I got stuck fixing an 873 and got so frustrated replacing that pickup tube. Never could get all the old fragments out. Of course the rubber grommet broke when disassembling and that stayed in there too. He never had a problem despite the junk still in the fuel tank.

bobcatmechanic · Mar 21, 2009

they really arent that bad except for a 751 and 853 and a 863 no side access all the others are in the front of the hydrostat or behind and with the side covers are easy to get to if your a big boy it makes it alot harder or short arms or real muscular arms because alot of the places you have to reach into or squeez your arm into takes almost being a contortionist artist or a twig or just doing it a bunch and knowing what to take off and where to reach in at as far as the pieces in the tank we just leave them in there and let er eat haven't had any problems out of pieces of the old tubes in the tank yet probably done 100 or so on all diffrent sizes of machines

BILL2009 · Mar 21, 2009

Thank you Gentlemen for the prompt replies...You have givem me a little hope..at least I don't have to pull the engine...Thanks again to all.Hope you guys have a good weekend

Cannon · Apr 27, 2009

Would someone post a diagram, or pic with caption would work as well. Am running (stalling) with same issues.

bobcatjay553 · Jun 18, 2009

i have a bobcat 553 1998 just bought it ran good for a week then started to stall but if you let it sit for a sec it would pick back up i thought it was running out of gas so i added 5 gal still the same but it still ran and work until you stated to whip it around and it would start again and now going up and down hill it wants to stall like now and does in seconds it seems if i use the bucket to lift the machine level sometime it picks the rev back up can anyone help i am clueless my first machine i would take it to service but its stuck on the hill on a level spot

763 Bobcat Fuel Pressure

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