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Hello, my name is***** will assist you.
Would you please post the serial number of the engine?
I think that the problem will be on the engine. You eliminated the gas tank when you tried another one.
When you had the carb off, did you also replace the base gasket?
Was the spring still attached to the plate when you had the fuel pump apart?
Did you also clean the carb, or just work on the fuel pump?
Did you also open the primer pump?
Do you know the compression on the engine?
When was the last time that it ran correctly?
Ok, is the carb on or off the engine currently?
Good it is off. Make sure that when you are installing the base gasket that you line up the hole in the gasket with the small hole on the block.That is the pulse hole for the fuel pump. If it is blocked, the pump will not work.
Did you notice of the old one was?
Since its off, open the bowl and make sure that the needle is not stuck in the seat.
might as well give it a shot and see if it will run.
No they wont. they are different part numbers.
Open the cap on the fuel tank and see if it will run better.
There is water going to the engine, right?
Just making sure.
With the cap open?
When you prime it up, do you hear any hissing from anywhere?
Going to need that compression test.
Did you get the fuel pump back together like this diagram?
Yes that is normal.
That is good.
What did you install on the other side of the plate from the spring?
How does the fuel filter look?
Will it run under throttle, and just not idle?
Ok, when you installed the spring and the ball for the primer pump, where was the ball located?
Ok, are you sure that it stayed there?
What is the RPM at idle on the engine?
is the carb off again?
Ok, I was going to have you inspect the reeds and a divider on the reed plate.
Your idle in gear in the water should be around 850 RPM.
They are simple to install, you may get a few extra ponies, not many.
No the piston is. The reeds control the fuel charge going into the engine.
When you swapped tanks, did you also swap hoses?
Yes. As the piston moves up and down, it generates a pulse that drives the fuel pump.
did you get a new bulb as well?
If the fuel line was coming apart, guess where the stuff from before the bulb winds up..
Because the fuel pump draws harder at higher rpm than at idle.
Can you run a straight line from tank to the engine? See how the engine runs then.
Im off to bed now. Talk tomorrow.
Was that without the primer bulb?
If the carb is already full, the pump would draw it in, that is what it is supposed to do.
Wow, you got 34 MPH out of a 25, thats great. How many turns from a light seat is the mixture needle?
Back it out to 1 1/2 turns. that is the starting point.
No, but it does control the idle air/fuel mixture. Will not effect the engine at WOT.
It will help the engine idle, and you may not need to pump the bulb any longer.
Back off the adjustment on the throttle arm. Lower the idle that way.