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Cub Cadet HDS2135 fuel Question

#1

MingoMowing

MingoMowing

I have a cub cadet 2135 with a kohler command 12.5 motor, got it on trade, the issue the guy was having was he said it needed a fuel pump, i added an aftermarket electric pump from auto zone that pumps 2.5-4 psi, it runs and drives fine other than it seems to kill of when i throttle down below 1/3 throttle, do i need to add a return line to the tank between pump and carbureator to reduce fuel to carb? with it killing off below 1/3 throttle it makes me wonder if im dumping too much fuel is why im asking


#2

M

mechanic mark

This is possibly fuel pump you need, call Jacks first.
Remember THINK & DO, automobile parts are made to fit automobiles & Lawn Tractor parts are made to fit lawn tractors.
Call toll free 1-877-737-2787. 9A.M. - 6P.M. MONDAY - FRIDAY & 9A.M. - 5P.M. SAT.
Let us know how it goes, thanks, Mark


#3

MingoMowing

MingoMowing

cant use the stock pump, the engine lobe that operates it is worn..... if i could use the original i would have gone that route, im asking if i need to simply run a return line between the pump and carb to reduce the amount of fuel, so id put a Y on the pump exit hose and one hose to carb and one to tank, i believe this will work but im just trying to bounce ideas off you guys


#4

Hammermechanicman

Hammermechanicman

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#5

Hammermechanicman

Hammermechanicman

When you say "kill off below 1/3 throttle" does it start blowing black out rhe exhault? Does applying partial choke keep it running?


#6

Scrubcadet10

Scrubcadet10

Hammermechanicman said:
When you say "kill off below 1/3 throttle" does it start blowing black out rhe exhault? Does applying partial choke keep it running?
Click to expand...
Yep, was just thinking the same thing


#7

MingoMowing

MingoMowing

no it does not keep it running


#8

S

slomo

That is because at 1/3 throttle or less, the charging coil is not supplying enough amperage to feed the new super duper electric wonder pump. Crank the revs up to 3600 and see how she runs.

It's not wise to idle down a mower engine. Doesn't charge the battery properly. Some don't have an oil pump, some do though. Splash lube engines are not recommended to idle down.

slomo


#9

S

slomo

Scrubcadet10 said:
Yep, was just thinking the same thing
Click to expand...
I wasn't. Pump is rated at 2.5 to 4psi at full amp draw. That shouldn't of overwhelmed the carb needle.

slomo


#10

Hammermechanicman

Hammermechanicman

This all sounds like a simple carb problem. Throttling the engine back probably has it transitioning from the high speed jet to the low speed circuit which is probably clogged. The battery would keep the fuel pump working even at low rpm and 4 psi should not over power the needle and seat.


#11

MingoMowing

MingoMowing

slomo said:
I wasn't. Pump is rated at 2.5 to 4psi at full amp draw. That shouldn't of overwhelmed the carb needle.

slomo
Click to expand...
so what your basically saying is drive it till the wheels fall off as is and dont worry bout it?


#12

S

slomo

I would install the OEM pump, delete the new electric one.

"Some mowers" with charging coils, at idle, hardly put out 10.5 volts. You need to check yours with a volt meter and a tachometer. Like the other guys stated, your carb could be clogged on the pilot circuit too.

slomo


#13

S

shirl

Scrubcadet10 said:
Yep, was just thinking the same thing
Click to expand...
Try a return line back to tank,I think it will solve your problem,thats too muck pressure.I had the same problem with mind,but as long I keep tank over half full I had no problem


#14

R

Ronni

MingoMowing said:
I have a cub cadet 2135 with a kohler command 12.5 motor, got it on trade, the issue the guy was having was he said it needed a fuel pump, i added an aftermarket electric pump from auto zone that pumps 2.5-4 psi, it runs and drives fine other than it seems to kill of when i throttle down below 1/3 throttle, do i need to add a return line to the tank between pump and carbureator to reduce fuel to carb? with it killing off below 1/3 throttle it makes me wonder if im dumping too much fuel is why im asking
Click to expand...
I recommend buying the fuel pump replacement for your mower rather than using a fuel pump not designed for the mower. The mower fuel pump is powered by the engine air pressure from the crank case so the fuel pressure matches the need for the engine. An electric fuel pump doesn't do that and that is probably why you are having your problem.


#15

Hammermechanicman

Hammermechanicman

It uses a mechanical pump powered by an eccentric in the engine.


#16

S

slomo

shirl said:
Try a return line back to tank,I think it will solve your problem,thats too muck pressure.I had the same problem with mind,but as long I keep tank over half full I had no problem
Click to expand...
It was rated at 2.5 to 4psi. Now what it actually delivers is unknown. Shouldn't overwhelm the needle at that psi level. Might be some Chinese wonder pump slugging out 40psi LOL.

slomo


#17

MingoMowing

MingoMowing

Ronni said:
I recommend buying the fuel pump replacement for your mower rather than using a fuel pump not designed for the mower. The mower fuel pump is powered by the engine air pressure from the crank case so the fuel pressure matches the need for the engine. An electric fuel pump doesn't do that and that is probably why you are having your problem.
Click to expand...
oem lobe that operates pump is worn, not an option to use it. have to use electric or replace internals so im going electric, the whole internals thing is gonna cost more $$$ than its worth.


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