Home › Forum › Ask A Member › mark 20 starting issue › Re: mark 20 starting issue
If I had this issue, I would install an AJ32A carb. It’s the right size for your 20 cu. in. engine, and designed for gravity feed. Gravity carbs operate with minimum head pressure, whereas fuelpump carbs require about 3 to 3-1/2 lbs of pressure.
You could try filling the bowl with fuel by simply pouring it into the bowl without the float installed. It will require about 1/2 fill to operate properly. See how long it runs in this mode. hi speed out ABOUT 1-1/4 turns. low speed out ABOUT 3/4 turn. If you could mount your tank a couple of feet above your powerhead while it’s in the test tank, the engine would probably respond better. just some idle thoughts. R.T.