CATransplant: Old style fuel pump filters

[Paul Moir]

This topic was drifting a bit so I thought I would start a new post. I agree about those old style filters, so this is what I've done:<br />

<br />(the pump on the left is the later pump, just killing two birds with one stone)<br />Thats a short automotive carburetor fuel element I think for a holley. The cap is the top from the stock fuel element. You have to remove the anti-syphon valve from the filter element, but after that it literally snaps into the cap of the stock filter.

 

[CATransplant]

Re: CATransplant: Old style fuel pump filters

Neat trick, there, Paul. I just put an automotive in-line filter on between the bulb and the engine connector. Lots of surface area, and good fuel flow.<br /><br />I like your solution, though, and it looks like it belongs in there. I might see about adding that to mine.

 

[CATransplant]

Re: CATransplant: Old style fuel pump filters

Now, to add to the thread drift, I have a question:<br /><br />I think I'm buying a nice-running '55 25hp Johnson. I want to dump the dual line fuel system. I have a spare pump for my '58 RDS-20. If I can mount that under the cowling and run the hose from the engine to the new pump, will that work OK? I can't see any reason why it would not, but I haven't seen where the pressure line comes from on the '55. Is it just a crankcase connection? Is there a check-valve somewhere so that only the pressure pulses go to the tank?

 

[Paul Moir]

Re: CATransplant: Old style fuel pump filters

Yes you can. There's two ways to do it.<br /><br />First, I think the '55 may have been set up to mount the fuel pump already. If you look at the exhaust cover there's probably three screw holes there for mounting it just like your '58. You can drill and tap one of the covers with a 1/8" NPT tap just the same too. Or simply use a spare one if you have it. Then block off the old air supply to the tank.<br /><br />The other, slicker, way is to use the old air supply nipple as a pulse driver for the pump. Behind that ports is a pair of check valves mounted to the reed plate, one for each crankcase chamber. One will have to be removed and the other will have to be blocked off.<br /><br /> http://tinypic.com/6ydulk.jpg <br /><br />The 25hp has got a lot in common with your 35hp. I think the flywheels may be a little different, and some other odds and ends (pistons). The 28hp uses the same pistons.

 

[CATransplant]

Re: CATransplant: Old style fuel pump filters

Gotcha. That picture helped. I like that idea, and it would be neat-looking...always good.<br /><br />I'm not going to use the 25...it's really cheap, so I'll sell it after doing whatever maintenance it needs. No tank, though, and I think it'll be more saleable with a single-line tank. I will look around a little, though, and if a pressure tank is available for not too many bucks, I won't alter the outboard.<br /><br />Thanks!

 

[Paul Moir]

Re: CATransplant: Old style fuel pump filters

Here's how I look at it:<br />$30-$50 for a double line tank from ebay with line.<br />$25 for a tank rebuild kit.<br />$10 for fresh hose.<br />$5 for new connector o-rings.<br />$20 shipping for the deal.<br /><br />vs<br /><br />$50 Good 6 gallon tank and line<br />($50) fuel pump<br />($20) Odds and ends (fittings)<br /><br />So it makes good sense to convert if you have a spare fuel pump. If you don't, the double line tank might make sense. Of course, those numbers will all vary depending on the condition of the tank from Ebay. If you can find a local junker, all the better.<br /><br />Might be a fun project, especially if you can find the right buyer.