I have checked the output of the fuel pump, the fuel lines, etc. I even used my hand vac and pumped fuel from the tank. Filter was about 2/3 full, but once running, it went back to looking empty. I can't see how the engine is even running. There is a breather device on the fuel tank that has a ball bearing inside, but it does not act like a check valve in either direction. B&S parts manuals do not mention this part other than being attached to the fuel tank. The engine is a 20hp V-Twin 40S8770009G1-20.0HP PRO XL30. I think the full speed rpm variations may be due to not getting enough fuel. Any help would be greatly appreciated.
Indicates a low fuel delivery
check for a blocked filter in the tank at the hose end
if you have a tap
check that sufficient fuel flows through it
the filter is passing fuel if it is going empty
check for a blocked filter at the carby bowl at the needle and seat
SOURCE: 91 nissan Sentra losses power at highway speeds
remove the front 02sensor and drive the car like that, remove means complety take it apart from exaust, if problem goes away or gets so much better then your catalitic converter at the exaust is restricted and need a new one
SOURCE: Ford F100 Fuel System
There are a couple things here. In the first place if you can pump fuel with the pump off the engine and pumped by hand doesn't mean that it will pump on the engine. See the stroke on the engine is very short, it only moves like 1/4 inch. So you could have a bad pump even though you are pumping by hand. The gas cap, will have no effect on this model. Yes the pick-up tube has a filter on the bottom of it, and it could be stopped up. You can remove this unit up through the top of the tank, got to wiggle it and turn it sideways, and if you can find a used one( New ones scarce and expensive) by going to used parts place, and look for 1967 - 1972, they are all alike. Lots a luck in fixing this great ole truck.
SOURCE: Have Yard Machine (model 12B264c062)
diaphram ,good idea but check fuel stem down in tank,it may have crak in it ,also disasemble carb and froce air (compressed air ) in all orfices and use welding tip cleaners and clean out all orfices,jets ,ports etc.
SOURCE: Diesel engine, grey market kubota, the turqouise
yes there is a low pressure pump and a high pressure(incjector pump) if your no getting fuel to engine check for low pressure pump to be working may also have air in system which is very hard to get out and a diesel wont run untill most or all air is gone
SOURCE: engine starving for fuel, fuel filter very low, almost empty
your fuel pump is diaghram actuated by pulses from crankcase pressure, if you look there is a small tube that runs from pump to valve cover, pull fuel line off carb and have some one crank it over to see if it's pumping. could be pump or blockage between tank and pump, if fuel flow seems good to carb, i would pull bowl off and check for dirt and also make sure anti run on valve, the thinghy that holds the bowl on to carb is opening properly, it should open and close when you turn key from off to run, beyond that it could be you have some water in your gas.
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