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My fuel system is sucking air from somewhere. I replaced the

Customer Question
fuel line from the tank...
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: 1 year ago.Category: Small Engine
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3/20/2016
Technician: Curtis B., Technician replied 1 year ago
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 29,118
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
Verified

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

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Customer reply replied 1 year 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 # *****
Technician: Curtis B., Technician replied 1 year 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?

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Customer reply replied 1 year ago
it does have a silenced but it have never stopped suddenly like it's been shut off.
Technician: Curtis B., Technician replied 1 year 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.

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Customer reply replied 1 year ago
solenoid
Customer reply replied 1 year ago
the fuel filter bubbles when the engine is running
Technician: Curtis B., Technician replied 1 year 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?

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Customer reply replied 1 year ago
replaced fuel filter too
Technician: Curtis B., Technician replied 1 year ago

What is engine in?

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Customer reply replied 1 year ago
cub cadet 2135 mower
Technician: Curtis B., Technician replied 1 year 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?

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Customer reply replied 1 year ago
mechanical pump brand new
Technician: Curtis B., Technician replied 1 year 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.

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Customer reply replied 1 year ago
ok I'll try that and get back with you in a few
Technician: Curtis B., Technician replied 1 year ago

OK>

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Customer reply replied 1 year 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.
Technician: Curtis B., Technician replied 1 year ago

So you eliminated the tank outlet line?

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Technician: Curtis B., Technician replied 1 year ago

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

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Customer reply replied 1 year ago
I removed the fuel line from the tank a placed it in a container of fuel and got the same results
Technician: Curtis B., Technician replied 1 year ago

Fuel line new?

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Technician: Curtis B., Technician replied 1 year ago

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

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Customer reply replied 1 year ago
ok
Technician: Curtis B., Technician replied 1 year ago

OK>>

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Technician: Curtis B., Technician replied 1 year ago

Did you find the problem?

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Technician: Curtis B., Technician replied 1 year ago

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

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Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 29,118
29,118 Satisfied Customers
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

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