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1972 9.5hp in-line fuel filter problem

K

KSflatlander

New member
Hi, I tried installing an in-line fuel filter on a 1972 9.5hp but it will not run with it in place. It is a new filter and I put it close to the fuel pump or just in side the motor cover. If I take the filter out it runs fine. If I put it back in place it will not run. Fuel is getting to the carb and I can see the fuel inside the in-line filter. Any idea why it will not run with the filter in place. I put a carb kit in it last fall, cleaned the fuel pump out, and it runs great without the in-line filter. Is the pump maybe too weak?
 
kimcrwbr1 said:
http://www.marineengine.com/parts/j...9222M&manufacturer=Evinrude&section=Fuel+Pump
The pulse pressures are different coming from the crankcase the neg pressure that pulls the fuel up is allways lower than the pos pressure I bet if you put the filter downstream from the pump it will work?
Click to expand...

Thank you. I will try putting the filter on the other side of the pump. It is a smaller hose going to the carb. I did not think of the pump being weaker on the tank side or incoming side of the pump. It already has a wire mesh type of filter on the pump. Maybe that is enough? I was only being on the safe side and put a real filter on it. A new pump is around $100. Thank you for responding and the information. I belive the pump is only a two port type.
 
Yeah that is a good point about these engines running that way for over 40 years. Sea foam is a good idea. I used it once in another small engine so I will get some soon and run it through this Johnson. I have been reading a lot lately about the ethenal effects on hoses. Not good. It has been helpful joining this forum. I usally just read what other people have posted. I have never owned an outboard before so working on this one has been both fun and a learning experience. I have also replaced the impeller and the lower end lube. All looked very good. Thanks again for the advise.
 
I put a carb kit and replaced the fuel lines last fall. I could not believe it had a cork float in the carb. I do need a good manual for sure.
 
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