double line to single line fuel conversion

[what66]

Hi I need some advice I have a 1951 25hp evinrudethatI want to convert from a double line pressure system to a single line fuel pump.<br />I just got this pump. http://www.picturetrail.com/gallery/view?p=999&gid=7064159&uid=2461186 <br />I figure all I need to do isrun a pressure line from the crank case to the pump pressure input.<br />and hook up the carb and fuel inlet.<br />doyouthibk this will work?<br />I have a 35hp that is set up this way so I think It will work what do you think?

 

[Paul Moir]

Re: double line to single line fuel conversion

Yup, just set it up like the 35hp. Is there a place on your 25hp to drill and tap out for a 1/8" NPT 90° barb fitting?<br />If or when you tap your cover, tap a bit and fit the fitting. The tap is tapered, so the deeper you tap, the more the fitting will thread in before tightening. Just make sure you don't tap too deep.<br /><br />You cannot use the old pressure tank line currently on the outboard because it's 'rectified' by a check valve on the reed plate. Just block this port off.<br />If you click on the little house icon on my post, you'll see a picture of my 28hp setup this way. The lower cover is tapped, and the pump is mounted on the exhaust cover plate on the far side of the motor, between the exhaust 'bubble' and the shift/throttle interrupter bar.

 

[rodbolt]

Re: double line to single line fuel conversion

hello<br /> best place to tap is on a transfer port cover after removing the cover.<br /> use a new gasket on the cover when reinstalling.<br /> some of the later engines had the fitting threads already there.

 

[jimmbo]

Re: double line to single line fuel conversion

Paul, is there a brightness control on that motor?

 

[what66]

Re: double line to single line fuel conversion

thank you for your help I got it now.

 

[johnson_sea_horse]

Re: double line to single line fuel conversion

Hi, I have a 1957 Evinrude 7-1/2 horse twin; could this engine be converted to the new style single feed hose system??<br />Thanks

 

[Paul Moir]

Re: double line to single line fuel conversion

China clipper - yes it can, but you want to use a smaller pump which mounts directly to one of the bypass covers. I think the one picured would be too large for the 7.5hp.<br /><br />jimmbo - nope!