1997 763 crank no start

[dpl096]

I picked up this 763 a while back and have used it a little. It needs work but it seemed to run solid - until yesterday. I started it up and left it idling for about 15 minutes to warm up. When I came back the machine wasn't running. Cranks and sputters once is a while but will not burn & run. Has a new battery in it and the starter isn't lazy. It is not out of fuel. The previous owner threw a universal 12v fuel pump on it at some point rather than repairing/replacing the lift pump. The universal pump is pumping fine. I have fuel up to the injection pump near the head. Before I go any further what else should I be checking? Also - take a look at the attached picture and can someone give me their best theory regarding the water spicket valve screwed into the engine? No hose hooked to it. Thank you

 

[mrbb]

check your fuses, and your key switch?

 

[dpl096]

I've not checked the key switch. What will I be looking for there? It turns over great - just sputters once in a while but will not run.

 

[CountryXJer]

Have you checked the fuel cutoff solenoid?

 

[foton]

that spigot is just to make draining coolant easier as a hose can be put on it for a bucket ,I assume. Since this is machine kinda new to you ,,Pull off the outlet of the electric fuel pump and place a hose on it and put hose into a clear glass jar ,turn on pump let it half way fill jar and turn off, let fuel sit for 5 min. and see if there is any water in it that has seperated out. If by chance your fuel filter has a drain in the bottom of it a sample can be pulled from there also. This will let you at least know the condition of the fuel systems tank contents good or bad.

 

[sunnyboy]

It's just possible the tank pickup tube has broken off. VERY COMMON on bobcats. The big giveaway is if you fill the tank up and it starts and runs for a while, then does what yours did (quits, cranks but no start). Basically the full tank of fuel might "make it" to the pickup tube but once you've used enough fuel, it no longer reaches.

Solution is a new pickup tube. Difficulty varies with the pickup location. Happened to me on my 853 and the tube was easy to reach with the cab up. My neighbor's bigger bobcat was miserable - tube was behind the open cab and really, really tough to reach. However, the actual part isn't too expensive.

 

[lmcl123]

Sunnyboy beat me to the punch This happened to both my 763 and 753. The 763 got a crack in at about the 1/2 full level. it ran fine down to that level and then had your symptoms. I'd fill it back up and it would run just fine. The one on the 753 just decided to break off cleanly at the full level.When you switch it out, you might want to replace the rubber grommet that the pick up tube goes through as they get old and brittle and water can leak by them into the tank. It wasn't to hard to replace. GLTY

 

[reaperman]

You can find the fuel pickup tube assembly on Amazon for about $12. I replaced mine last fall with an Amazon kit and it's worth the money even if you dont need it because you will. This is a very good video to watch

 

[legman1947]

I picked up this 763 a while back and have used it a little. It needs work but it seemed to run solid - until yesterday. I started it up and left it idling for about 15 minutes to warm up. When I came back the machine wasn't running. Cranks and sputters once is a while but will not burn & run. Has a new battery in it and the starter isn't lazy. It is not out of fuel. The previous owner threw a universal 12v fuel pump on it at some point rather than repairing/replacing the lift pump. The universal pump is pumping fine. I have fuel up to the injection pump near the head. Before I go any further what else should I be checking? Also - take a look at the attached picture and can someone give me their best theory regarding the water spicket valve screwed into the engine? No hose hooked to it. Thank youView attachment 10973

 

[legman1947]

Ive been buying and selling these things for over 30 years. The first thing you need to do is look at the top part of the fuel filler tube and mark a spot to drill that, so you can runa piece of 5/16 steel brake line down through that and drill it! After you have the hole in it angle your drill slowly and elongate that hol so the brake line will lie flat along the inside of that and down to the fuel tank!

]You dnt need a filter there as you can add an inline filter and a new primer bulb before it goes into the filter!

You already had the common sense to pur a electric pump on it so you have that part figured out!

This modification is critical, because the idiots at Bobcat really screwed a LOT of people with their stupid rubber hose fuel iike because a LOT of Bobcats have gone up in smoke because of that AND the fact that rubber and diesel dod NOT mix!!!.....which could very well be YOUR problem?

Next thing on your list will be to bleed that and for that i made a fool-long piuece of 6 inch PVT pipe (Menards) ......added 2 caps and the neceddary fittings, a shrader (tire) valve and a brass ball bvalve abd a couple fittings to put a filler cap on the top of that. Tota cast was about $100. With that I can put some diesel in it, hook it up to where the fuel line gooes on the loader...... then charge the reservoir with 10 - 15 pounds of air and pressurize the fuel system, allowing you to start the machine with no problems!!!


Then after you got it running just swap fuel lines back to the loader's STEEL fuel lne and your loader wilkl NEVER be starved for fuel again!!!

Not only that, you can also use your new pressure tool to put gear oil in a differential or use it for other tasks on any machine, or vehicle!!

If you put 60 PSI of air in it you can even squirt your prick neighbor's truck with gear oil!!!

 

[legman1947]

You can find the fuel pickup tube assembly on Amazon for about $12. I replaced mine last fall with an Amazon kit and it's worth the money even if you dont need it because you will. This is a very good video to watch

Yeah, that's a great idea - replace JUNK with MORE junk!!!

 

[legman1947]

It's just possible the tank pickup tube has broken off. VERY COMMON on bobcats. The big giveaway is if you fill the tank up and it starts and runs for a while, then does what yours did (quits, cranks but no start). Basically the full tank of fuel might "make it" to the pickup tube but once you've used enough fuel, it no longer reaches.

Solution is a new pickup tube. Difficulty varies with the pickup location. Happened to me on my 853 and the tube was easy to reach with the cab up. My neighbor's bigger bobcat was miserable - tube was behind the open cab and really, really tough to reach. However, the actual part isn't too expensive.

So you replaced a JUNK rubber hose with ANOTHER junk rubber hose, instead of installing a piece of STEEL brake line in it, to replace that stupid RUBBER HOSE? You shOuld be working for BOBCAT!!!

Absoluteyl BRILLIANT!!!STEEL

 

[reaperman]

Yeah, that's a great idea - replace JUNK with MORE junk!!!

Thanks for the steel line tip, it's the first time hearing about it. I was lucky, my original plastic line lasted for 25 years. If the replacement lasts half that long, I'll probably be dead.