Tractor cutting off after a few seconds

jeepinmatt

jeepinmatt

#1 WEBWHEELER
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Mar 24, 2005
Location
Stanley, NC
I've got a early 90s New Holland L555 skid steer with a Kubota v1902 diesel. It started acting like it was running out of fuel, and it was low, so I filled it up. It was still running, just not 100%. Then when I cranked it up last week, it started up fine, idled a few seconds then cut off. I repeated this cycle at least 10 times with the same results.

Seemed like it was starving for fuel, so I replaced the inline filter (cut it open, it was TERRIBLY dirty), and based on that replaced the canister filter on the engine, but it looked fine. Opened up the bleed, waited for the electric pump to prime, then started it back up. Same deal, it would run fine for a few seconds, then die out.

I did discover that the longer I left the key on before cranking, the longer it would run. No major correlation, but 5 seconds of key on equaled 2 seconds of run, and 2 minutes of key on equaled maybe 15 seconds of run at lower throttle. It will even sit and idle, but dies out if you come off of idle very much. It will crank and run at wide openish for a few seconds too, but runs out of fuel quicker.

The configuration is fuel tank>inline filter>inline electric pump>canister filter>injection pump. A rebuilt injection pump is about $500, a new electric pump from the dealer is $150, and a generic pump on eBay is $30. When I primed it, it took forever (15-20 minutes) for the electric pump to fill the 3" diameter 3" tall canister filter, and it barely puts out a trickle with the line loose. I'm thinking that the electric pump is toast, and it makes enough pressure to feed the injection pump if you let it build up with the key on, but it can't sustain it.

What says the wisdom of NC4x4?
 
Lift puimp is failing. Keep testing it and it will take the injection pump out also
 
Ron said:
Lift puimp is failing. Keep testing it and it will take the injection pump out also
Click to expand...
How much testing will it require to take out the injection pump? And what would cause the injection pump to fail in that manner?
 
check ALL the rubber lines --even a small crack will let it suck air.
sometimes it hard to find such a leak. does it have a primer bulb?
seen those go bad too.
 
If there is a direct correlation to leaving the key on and run time, it sounds like the pump is pumping fuel to the injection pump and when running the injection pump consumes more fuel that is available.


Some injection pumps use diesel fuel to lube the moving parts, so running it dry often can ruin the pump.
 
Black Bear said:
Some injection pumps use diesel fuel to lube the moving parts, so running it dry often can ruin the pump.
Click to expand...


^ This.

Pretty sure the IP on your machine is this way. Replace that electric lift pump and just hope you haven't done any damage to the injection pump. Bucket test the new lift pump to ensure its working properly before trying to crank the machine.
 
So then the next question is: $20-30 china pump, or $140 New Holland pump (thats probably also made in China with possibly higher quality)?
 
Alot of the cnh parts we get have the China stamp on them.
 
/\. I was gonna say get a electric in line diesel pump (green one) from Autozone
It should have filled that small of a filter in a minute or so maybe less
 
Bagt said:
/\. I was gonna say get a electric in line diesel pump (green one) from Autozone
It should have filled that small of a filter in a minute or so maybe less
Click to expand...
Yeah, they also had a little green Mr Gasket one, but the description says its for transfer tanks, so I don't know how well it would hold up to continuous duty.
 
Does the electric pump sound like it is straining to pull the fuel? Strainer in the tank? Junk clogging the port on the tank?
 
sgtbriangreen said:
Does the electric pump sound like it is straining to pull the fuel? Strainer in the tank? Junk clogging the port on the tank?
Click to expand...
Sounds like it's pulsing instead of pumping, but it's always been very quiet.
 
I'll second the opinions above. Replace the electric online pump with one for diesel and you'll be good to go. You might even use a hand operated vacuum pump with gauge to test for leaks in the fuel lines (attach to the pickup side at the tank. It should hold vacuum) and if it has an online pump it doesn't need a primer bulb
 
Replaced the electric pump with the one from autozone and now it's running great. Once I got the old one off, I realized that the ground wire was pretty deteriorated, so I'll test it with a good wire and maybe keep it as a spare.

Thanks for the good input fellas!
 
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