Hesitation at 3/4 speed

[JLFLYNN]

I have a 1989 100 HP Johnson - V4. I have a water separator and an in-line fuel filter (one of those small white plastic filters)

I never had the fuel filter but I put one in for added protection. However, my engine would hesitate and drop RPM while I was going for about 10 - 15 minutes at 3/4 speed. I was not sure what the problem was.............but I removed the in-line fuel filter and the problem went away.

What do you think it was? Fuel pump is getting weak? Is a fuel/water separator AND an in-line filter too much resistance for the pump?

What is more important? Separator or filter? or does the fuel/water separator ALSO act as a filter?

Kindly advise when you get a chance.

Thanks!

 

[rickdb1boat]

Re: Hesitation at 3/4 speed

The water/fuel separator that I have looks like an oil filter. It's pleated on the inside and should catch anything that the little plastic screen filter would. I have heard of others that have the same problem as you when they added another filter to the system. Seems to be more prevalent with higher HP engines. I would do away with the inline filter....I think the resistance is too much with both...

BTW- What size fuel lines are you using?

 

[JLFLYNN]

Re: Hesitation at 3/4 speed

Not sure of the size of the fuel line. I have the same type of water/fuel separator........looks like an oil filter & I screw onto the metal bracket, hanging upside down...fuel comes in one way and out another

Thanks again for your help.

JLF

 

[rickdb1boat]

Re: Hesitation at 3/4 speed

If you're using 5/16", I would switch to 3/8" all the way. That may do the trick....