1954 Fleetwin Fuel Pump Upgrade

[Crowsbeak]

I have a 1954 Fleetwin that I got running this past fall and for a winter project I am looking to add a fuel pump. I know you need to tap the bypass covers on this model for it to work right. The bypass cover on this motor is OMC part number # 202527 and this part does not have the boss cast into it for the fuel pump pulse line. Doing some looking I have found a OMC # 203253 bypass cover online that does have the boss cast into it and appears be the same general shape so I am wondering if anyone knows if the 202523 will bolt up in place of a 202527 or not. The reason I am curious is that I have read that on the 202527 there is not much meat for the hose barb to thread into.

 

[HighTrim]

Doesn't look like much meat, but it will be fine. Ive done many of them with the original bypass cover. I drill/tap, then put a bead of epoxy around the outside to help seal and provide a little more support. Then you are good to go.

 

[Crosbyman]

No Title

I did several oldies incl a 7.5 ....a B&S round pump... works like a charm using 3 hoses method ........but the square OMC pump ($$$) on a aluminum plate method .. over a bypass cover is the best way and no need for tapping except the... new ... OMC pumps are more expensive .

just cut a plate (1/16 or 3/32) to fit directly OVER the bypass cover... drill a 1/4 inch hole in the bypass cover itself directly under the aluminum plate.
​ mount the plate with gasket goo and mount the pump over it . Drill the alu. plate behind the pump for the vacum pulses ... put the gasket under pump and drill 2 extra holes to bolt the pump on the plate


​plug the pulse nipple behind the carb and change the side connector to a single line one ... your done !

 

[HighTrim]

If you are going to make a plate, first fill the void in the bypass cover with JB Weld, then drill through plate/cover together. That air space left will limit your pulse if not filled.

Of course, the best way is to get a bypass cover ready to rock if you can find one.

 

[Crowsbeak]

Thank Crosbyman and HighTrim for your advice and suggestions. I currently have the round B&S pump that I plan to use on this conversion. I used the Mikuni on my 5.5 conversion but the angle of the Briggs nipples seems better suited for this motor. HighTrim when you mention getting a cover that is ready to rock do you mean finding one that already has the OMC Fuel pump mounted to it. I thought the 7.5's were discontinued before OMC began adding the fuel pumps in the late 50's early 60's? I know there was a substantial amount of parts interchangeability so is there a 60's model OMC that would have had the fuel pump and that the bypass cover would bolt right on to the 54?

 

[Crosbyman]

No Title

here is how I mounted the round pump on a 5.5

the triangular bracket was made with cut-up common 90deg. angles and the pump bolted with nylon nuts

 

[Crowsbeak]

Thank you for the ideas for mounting, I am looking forward to getting started on this project.