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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26485
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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My fuel system is sucking air from somewhere. I replaced the

Customer Question

my fuel system is sucking air from somewhere. I replaced the fuel line from the tank to the fuel pump. also replaced the fuel pump. the mower runs a while the scarves for fuel. if I shut it off and let the fuel filter refill itself it runs for a while again and so on and so on.
JA: I'll do all I can to help. Is there anything else important you think the Small Engine Technician should know?
Customer: I removed the fuel line from the tank and put it in a jar of fuel to eliminate the fuel tank having a leak. it did the same thing.
JA: I'm sending you to a secure page on JustAnswer so you can place the $5 fully refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and connect you two.
Submitted: 11 months ago.
Category: Small Engine
Expert:  Curtis B. replied 11 months ago.

Does engine quit? And how long before it will restart? What is the engine make and model number?

Customer: replied 11 months ago.
it will run out of fuel completely. but you let it sit a few minutes and fuel filter refills and it will run fine until it starves for fuel again. it is a kohler 14hp command ohv. spec # *****
Expert:  Curtis B. replied 11 months ago.

You said it does the same from another fule container. Fuel filter is never showing full when engine is running. So it may not be loosing fuel. Does it have the electric solenoid in the carburetor base? Does it stop suddenly, like fuel is shut off?

Customer: replied 11 months ago.
it does have a silenced but it have never stopped suddenly like it's been shut off.
Expert:  Curtis B. replied 11 months ago.

You replaced fule pump, but did you check the pulse line from the crankcase for pulse? It is what has to power the fuel pump.

Customer: replied 11 months ago.
solenoid
Customer: replied 11 months ago.
the fuel filter bubbles when the engine is running
Expert:  Curtis B. replied 11 months ago.

Only place fuel system can get air is on the suction side of the fuel pump. Everything after pump is under pressure. You didn't mention fuel filter, was it replaced?

Customer: replied 11 months ago.
replaced fuel filter too
Expert:  Curtis B. replied 11 months ago.

What is engine in?

Customer: replied 11 months ago.
cub cadet 2135 mower
Expert:  Curtis B. replied 11 months ago.

I would have thought fuel tank debris, if you hasn't already checked with a separate fule container. Does this engine have the mechanical fuel pump, not pulse pump?

Customer: replied 11 months ago.
mechanical pump brand new
Expert:  Curtis B. replied 11 months ago.

I'm not convinced it is sucking air. If you take test line direct from fule pump suction, into container, no fule filter, will it still stall? If it does, you do not have a suction probem/ something else is going on.

Customer: replied 11 months ago.
ok I'll try that and get back with you in a few
Expert:  Curtis B. replied 11 months ago.

OK>

Customer: replied 11 months ago.
ok I removed the fuel line from the top side of the filter and put in a container of fuel. the mower ran fine until the container was dry.
Expert:  Curtis B. replied 11 months ago.

So you eliminated the tank outlet line?

Customer: replied 11 months ago.
Expert:  Curtis B. replied 11 months ago.

Would make me think that the fuel tank outlet is restricted.

Customer: replied 11 months ago.
I removed the fuel line from the tank a placed it in a container of fuel and got the same results
Expert:  Curtis B. replied 11 months ago.

Fuel line new?

Expert:  Curtis B. replied 11 months ago.

Do a vacuum test of the line, it may have a pin hole in it!

Customer: replied 11 months ago.
ok
Expert:  Curtis B. replied 11 months ago.

OK>>

Expert:  Curtis B. replied 11 months ago.

Did you find the problem?

Expert:  Curtis B. replied 11 months ago.

I didn't hear back from you. Was hose sucking air?