nautigator
New member
"I have a pair of 150 Opti'
"I have a pair of 150 Opti's and one of them wouldn't crank. I isolated the issue to lack of fuel. I could hear one of the motors' pump prime the system and then shut off. The other nothing. While tracing the circuits I found a burnt/melted fuse. I replaced the fuse and the pump would prime and the engine would fire and run. I read somewhere on the net that the fuel pressure should be 90 psi and the air pressure should be 80. The measurements I recorded were 80 & 80. I ran the motor about 15 mins and checked the fuse, it was very warm approaching hot. I am fair to partly dangerous when it comes to wiring, so I am sure this means either the connections are poor or the pump is drawing way too much current. I checked the resistance from the fuse holder to the connection closest to the fuel pump. It measured 0.01ohm. I am figuring that to be acceptable. Next, I connected the pump back up and connected my fluke across the fuse socket to measure the load the pump is using. At idle, it draws roughly 12.5 amps, if I pick the RPMs up to about 2,000, it reads just over 15 amps. I repeated this test on the other motor and found the draw to be about 3.5 amps. I don't have much knowledge of these motors, but I feel the pump needs replacing. My question is have I isolated this properly? Am I missing something? How difficult is it to R&R? Any and all insight and thoughts are welcome. Also, any thoughts on where to get the replacement part from?
Thanks."
"I have a pair of 150 Opti's and one of them wouldn't crank. I isolated the issue to lack of fuel. I could hear one of the motors' pump prime the system and then shut off. The other nothing. While tracing the circuits I found a burnt/melted fuse. I replaced the fuse and the pump would prime and the engine would fire and run. I read somewhere on the net that the fuel pressure should be 90 psi and the air pressure should be 80. The measurements I recorded were 80 & 80. I ran the motor about 15 mins and checked the fuse, it was very warm approaching hot. I am fair to partly dangerous when it comes to wiring, so I am sure this means either the connections are poor or the pump is drawing way too much current. I checked the resistance from the fuse holder to the connection closest to the fuel pump. It measured 0.01ohm. I am figuring that to be acceptable. Next, I connected the pump back up and connected my fluke across the fuse socket to measure the load the pump is using. At idle, it draws roughly 12.5 amps, if I pick the RPMs up to about 2,000, it reads just over 15 amps. I repeated this test on the other motor and found the draw to be about 3.5 amps. I don't have much knowledge of these motors, but I feel the pump needs replacing. My question is have I isolated this properly? Am I missing something? How difficult is it to R&R? Any and all insight and thoughts are welcome. Also, any thoughts on where to get the replacement part from?
Thanks."