OMC FUEL PUMP PROBLEM

[Jimscraft]

I have a 95 ChrisCraft with a 4.3 VolvoPenta/ OMC engine with an electric fuel pump. I am having an occasional problem that i need advice about. The boat will always start right of the trailer,but after a few minutes of running the engine will die. The carb. will be dry and no fuel being pumped through the line. I can start the engine up with carbcleaner and after about a half a can later the engine will run on it's own, I will not have any more problems starting the engine the rest of the day and the engine doesnt skip a bit.It seems to me that the fuel pump is loosing its prime after the boat sits up for awhile. I dont have this problem if I use the boat every day. I was told that there is a check valve in the fuel pump that can leak down and cause this problem. I dont think it is electrical because the boat will run fine all day after getting it started. Has anyone had this type of problem before? How can I be sure it is the fuel pump? Thanks for any Help!

 

[loadnet]

Re: OMC FUEL PUMP PROBLEM

Hi - just some thoughts..<br /><br />To rule out a suction problem on the draw side of the pump...<br /><br />You can disconnect the fuel line between the fuel pump and the fuel filter and stick the fuel pickup line in a clean gallon of gas, and see if the problem goes bye bye..<br /><br />If it goes away you know the pump is fine and the problem lies before the pump, such as a bad fuel filter gasket, bad gasoline hose or the vent is clogged in the fuel tank causing a vacumn inside the tank shortly after firing it up.<br /><br />Now if the problem is still there.. while sucking fuel from the gallon gas tank you can throw a fuel pressure guage between the pump and the engine to see if the pumps pressure is operating to specs.<br /><br />If the pump's fuel pressure is way lower than specs you know you should change out the pump.<br /><br />If it is running at specs no problem, I'd head for the carb.<br /><br />Knowing what your engine requires for fuel pressure is important before you start ruling out the pump so check with your local dealer for the fuel pressure information.<br /><br />Hope this helps a bit..<br /><br />Pat B. customerservice@401hosting.com

 

[Jimscraft]

Re: OMC FUEL PUMP PROBLEM

Thanks cap. I'll give it a try. Do you know of a good source if I need a new pump?