Bobcat 1999 763F would not stay running - Replaced fuel lines and more

[HarryN]

My 763F had the classic... “would start right up for a few seconds to a minute, then die issue”. SO, I went about replacing the entire fuel ine from the pick-up tube to the Lift Pump. The parts used are all Bobcat stuff and the part numbers are illustrated. My 763F pick -up tube has no check valve or screen (Bobcat says that's correct). So I guess blowing a bit of compressed air back toward the tank to remove gunk in the line would not be a problem for this machine. I notice others talking about those valves and screens though. I assume the 763F just collects the crap in the fuel filter. The hardest part was to push the rubber grommet (bushing) into the fuel tank. You have to lift the cab and contort your body to get at it. Once that's in the job is easy. From the Brass Elbow I used the standard 1/4 inch fuel hose all the way to the Primer Bulb. By the way, the Primer Bulb in the picture is actually tilted wrong. The end closest to the Lift Pump should be higher. The Primer has the check valve on the side closest to the fuel tank. That's what keeps the fuel from flowing back into the tank. At a minimum the bulb should be horizontal, but better if angled up a bit so the check valve can work correctly. There is always an ARROW on the bulb, so point it up slightly and to the direction of the Lift Pump. That's the direction of the fuel flow too. Not showing in the picture is a short section of Clear fuel hose I put on between the bulb and the Lift Pump. That gives me a visual to see if it's sucking any air. In summary I replaced in order: Pick-up tube, Compression ring, Brass elbow, Robber bushing, 1/4 inch Fuel line, Primer bulb, 5/16 inch Clear fuel line, and Lift pump. Total cost Bobcat prices.... about $150. The most expensive part is the lift pump. You can find one on eBay cheaper using the Bobcat part number shown.
After the change out the 763F is running perfect! Hope this helps someone having an issue like I did.

 

[Tazza]

Nice write up.
The one issue you *may* have without the strainer/one way valve on the pickup tube is priming. I found that on a machine i did this too, i needed to remove one end of the line after the hand primer and restrict it so you got some back pressure to make the one way valve in the hand primer to work properly. Once you get fuel in it, you have no issues though.

 

[antfarmer2]

Nice write up.
The one issue you *may* have without the strainer/one way valve on the pickup tube is priming. I found that on a machine i did this too, i needed to remove one end of the line after the hand primer and restrict it so you got some back pressure to make the one way valve in the hand primer to work properly. Once you get fuel in it, you have no issues though.

One more thing to look for is the little round brass wheel that is the bleeder is closed after bleeding and there is a little oring in there that can crack and give trouble