Gas lines????Please help

[buckstop108]

:redface:I need to change the fuel lines/hoses to my outboard. When I looked to get the size off the hose one section was 5/16 motor side of the primer ball and on the tank side it was 3/8 . What is the correct size for a 1992 Evinrude 85 hp outboard tiller with oil injection? If I go with the 3/8 do I need to be concerned with what that does to the oil mixture? I imagine it was all calibrated at the factory with how much fuel goes through the line. While changing the hoses I was going to add a water seperator as well. This would go onto the tank side of the primer ball correct?

 

[Barnacle_Bill]

Re: Gas lines????Please help

Most hoses are 3/8 and that doesn't have anything to do with the oil injection. Water seperator goes between the tank and primer bulb.

 

[buckstop108]

Re: Gas lines????Please help

Thank you for the help Bill, Seloc Repair Manual was the first thing that I purchased after the boat. I did refer to the owners manual as well as the Seloc. The owners is calling for 5/16 and the Secloc is calling for 3/8, the boat has both. So I'm sure you can see how this might be a little confusing to the beginner. I guess the better question would have been, " If I am adding the extra filter would the fuel flow be restricted too much with the 5/16 and would I be better served with the 3/8 if this doesn't negatively effect the mixture of oil?"

 

[rickdb1boat]

Re: Gas lines????Please help

Neither size line will affect the flow of the mixture and either size will work fine on your 85 HP engine. But if it were me, I would use 3/8" line and put the filter between the tank and the bulb as suggested...

 

[PW2]

Re: Gas lines????Please help

My 50 hp takes a 3/8" hose
My 6 hp takes a 5/16" hose

Both engines work fine on either hose.

 

[buckstop108]

Re: Gas lines????Please help

Thank you all for the help. I will go with the 3/8. I have been looking into the installation of this water separator nothing has ever been mentioned about a shut off valve before the filter. I was thinking that this might be a good idea for when it comes time to change the filter to keep fuel from running all over the place and reduce the pressure during replacement. good or bad idea??

 

[Dhadley]

Re: Gas lines????Please help

Motors up to, and including, V4 crossflows will be fine with 5/16" ID hose. 3/8" ID is even better.

The main problem with shut off valves is the ID. Most have very small passages and that can create a fuel restriction. Unless the filter is below the tank it won't flow fuel when you take the filter off.

 

[buckstop108]

Re: Gas lines????Please help

OK great then the shut off valve serves no purpose.

 

[Gary H NC]

Re: Gas lines????Please help

MMMM, thats got me wondering.My 175 has 5/16 hose from the primer ball to the engine.The rest is 3/8th. Could that be my low WOT problem?
Sorry,not trying to hijack the thread....

 

[rickdb1boat]

Re: Gas lines????Please help

Gary, I would change over to 3/8" all the way...

 

[Gary H NC]

Re: Gas lines????Please help

Thanks Rick.

 

[buckstop108]

Re: Gas lines????Please help

Gary you didn't highjack anything. The more information the more I learn. It was actually nice to see I wasn't the only one.

 

[Gary H NC]

Re: Gas lines????Please help

I never really thought about it.When i bought the boat the previous owner had put a new ball and line goint to the motor.
I replaced all the 3/8 line with new because it was cracking bad.
The ball and hose that connects to the engine was a pre made deal with the clamps pressed on.
I guess i need to look for a ball with 3/8th fittings on both ends and the connector for the motor..?

 

[Dhadley]

Re: Gas lines????Please help

Definately get a bulb with 3/8" fittings. That can make a huge difference.

 

[Gary H NC]

Re: Gas lines????Please help

Definately get a bulb with 3/8" fittings. That can make a huge difference.

Thanks Dhadley,
Just looked in the Iboats store.They have the 3/8th female fitting for the engine side.Just need to find the ball.
I guess a drive over to West marine..(god i hate that place)..they are just way out of line on the prices.