My friend has a problem with a boat he just purchased. It has the above motor and he is not getting very much fuel to the cylinders. When I put some into the cylinders it fires right up but will not pump it on its own. I was told by a dealer that the fuel pump outlet should have 5-8psi of pressure. I do not have a gauge. He said that you should not be able to hold your thumb over the outlet of the fuel pump while cranking the engine over. I tried and found that I could keep my thumb there but there was some pressure. I slowly removed my thumb and the fuel sprayed sideways for a few seconds. There is very little fuel in the fuel filter housing. Not sure if the diaphragm is bad or what. I have no knowledge of this engine. I am asking for my friend who does not own a computer. If you can help, please e-mail me at email@example.com.
I thank you for any help you can provide.