Fitting a Fuel Pump

E

Eagle43

Senior Member
I'm looking for some advice from the experts. I'm in the process of fitting a fuel pump to the 1951 flathead that I worked on last winter and hope to fire up soon and install in my 1952 F1. I bought a new fuel pump which I think is correct for this motor. I also acquired a stand from a 1948 Mercury M3. I know this is not correct for this motor but I'm thinking to ditch the draft tube and use this instead for ventilation. My problem is that with the 1/2" spacer that I made and which brings the fuel pump to the correct height in relation to the push rod length there is no clearance between the fuel pump and the intake. The pushrod is 8 7/8". What do I do to fix that? Some options come to mind:
1. Make a thicker spacer and get a longer pushrod.
2. Shave off some material from the intake where the fuel pump touches.
3. Shave off some material from the bottom of the fuel pump where it touches the intake.
Any advice would be appreciated. Thanks.
 

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My advice, (and you probably won't like it ) is to get rid of the mismatched fuel pump stand/ oil filler and install the correct pump stand that will use the 10-1/16 long push rod that goes with that intake manifold.
 
43,
You MUST use the 8 ba push rod because it is larger in dia than the '48 on
back push rod, remember the push rod bushing in the block. The difference between the the 2 stands from the center line of the 5/16 - 18 fuel pump attaching holes to the base where the stand sets on the intake is 1.200. You have 'shortened' that to .700 with your .500 spacer. If you shorten your 8 ba push rod .700 you'll be in business. You must remove the end of the p/r that goes into the block and do the shortening on the hollow portion of the p/r then reinstall the hardened end.

Most of the motors I do are 8ba and we frequently 'dress' them with early external
components.
Please feel free......any and all.....to fill any blanks I've missed.
Charlie ny
 
The 8BA fuel pump stand I have measures 2.600 to the C/L of the mounting bolts. That along with the thickness of the intake manifold (2.312) will give the overall distance to the intake mounting surface of 4.912 that will allow the use of the standard 8BA push-rod that measures 10 1/6" long.
Keep in mind that the 8BA stand pump mount surface is also kicked off to about a 45 degree angle towards the drivers side, not straight forward like the one you have.
 
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43,
I would shorten the push rod and not go taller that the 1/2" spacer.

Shortening the p/r is a 5 minutes job , and the job looks better to my eye.
Charlie ny
 
I'm guessing 43 has that figured out.......if this was my build I'd loose the extra deep
base on the pump and use the original style AC or Holley...much less deep
OR
a 1/8" thicker spacer

and adjust the math
Charlie ny
 
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