valvebounce
Regular Contributor
I have fitted a new fuel pump,the ad was a bit vague,it turns out the pump is for the 75hp plus.
It fits exactly the same as the old pump.The fuel outlet nipple to the carb on the pump is a larger dia than the one on the old pump.
I changed the nipple over for the one off the old pump.
My problem is now,that the fuel filter sight glass doesn't stay full.The motor will tickover all day nice and smooth,but if I increase the revs,the fuel filter empties and the motor runs out of fuel and cuts out.
I am wondering if the higher capacity new pump isn't getting enough vacuum pressure from the 25hp engine,and really needs more vacuum pressure like it would get from a higher hp engine.
Has anybody got any idea whether my theory is correct?
I have a new primer bulb and pipework on it,and have put the fuel line pickup pipe directly into the fuel tank.
It ticks over great,but still empties the site glass when I rev it up.
I have also tried it by putting the fuel pipe directly onto the fuel filter,and cutting out the connection fitting on the engine,with the same results.
It fits exactly the same as the old pump.The fuel outlet nipple to the carb on the pump is a larger dia than the one on the old pump.
I changed the nipple over for the one off the old pump.
My problem is now,that the fuel filter sight glass doesn't stay full.The motor will tickover all day nice and smooth,but if I increase the revs,the fuel filter empties and the motor runs out of fuel and cuts out.
I am wondering if the higher capacity new pump isn't getting enough vacuum pressure from the 25hp engine,and really needs more vacuum pressure like it would get from a higher hp engine.
Has anybody got any idea whether my theory is correct?
I have a new primer bulb and pipework on it,and have put the fuel line pickup pipe directly into the fuel tank.
It ticks over great,but still empties the site glass when I rev it up.
I have also tried it by putting the fuel pipe directly onto the fuel filter,and cutting out the connection fitting on the engine,with the same results.