Great question. OP disappeared. As they say on Duck Dynasty, "He gone".
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UPDATE: SOLVED! Only runs if tank 1/2 full +?? Carb problem?
- Thread starter FatJack
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FatJack
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Hi All, Thanks for all the input. I was away and computer free for the weekend so apologies for the delay. There is no fuel pump, gravity fed, so I am going to wait for it to happen again and then investigate in order: 1) air lock/vent in tank/cap 2) fuel filter (too fine?) 3) the whole fuel line end to tend 4) carb.
I will post what I find out.
I will post what I find out.
Hammermechanicman
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Common issue on gravity systems is wrong fuel filter. Many paper type filters have small enough pores that the fuel surface tension causes fuel to stop flowing at a certain level in the tank. Also, a fuel line that ruses up higher than the bottom of the tank will cause fuel flow to stop at the height of the fuel line.
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"I'm back, Jack"!
Generally on gravity feds i usually fit the red or white briggs filters, however i've also used Wix 33011 on my own gravity fed systems with no issues.
Hammermechanicman
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The stens paper filter seems to work ok with gravity systems but i fit the red screen filters on customer machines just to be sure. Every year i get a couple mowers in where cust wanted a better filter and installed a paper one and then have fuel flow problems.
bertsmobile1
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I think Steve was too busy emptying those cans behind him when he filmed this one.
Yes a paper filter will filter finer than the screen
However if the crud is fine enough to pass through the screen, it will also pass through the main jet & on most carbs the idle jet as well
Hammermechanicman
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Probably tens of millions push mowers came with no type of fuel filter. When equipment started having fuel pumps it was easy to add a filter. The original filters were there because metal tanks were prone to rusting. With the switch to plastic tanks rust isn't much of a problem but filters don't hurt anything so they stayed. I have changed hundreds of fuel filters and the only plugged up ones was from water or the jelly like phase separation goo you get from old E-gas. I have cleaned hundreds of carbs and i i can't remember the last one that actually had a problem from dirt. Usually old gas is the problem. Most fine dirt settles out in the bowl of float type carbs and not cause a problem.
Use or don't use your filer of choice. Whatever works for you.
Use or don't use your filer of choice. Whatever works for you.
Hammermechanicman
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People watch this and then go out and put a filter on thay MAY or MAY NOT work. Depending on the height of tank above the carb and the micron size of the paper element things might not work properly.