Fuel pump arm question

-

jdsduster

Well-Known Member
Joined
Aug 5, 2011
Messages
1,293
Reaction score
262
Location
indiana
Are the mounting patterns the same on sb and bb?is the only thing different are the arms?since carter don’t make the 6902 I was wondering if I could get the 6903 and use my 6902 arm
 
I'm not familiar with the numbers you are quoting. But I recently discovered that Carter has superseded the number on the small block fuel pump. The new part number is Carter M6866, if you are looking for the correct small block pump. You didn't state which engine you had.
 
street 6.5 psi.do you know if the pump arms interchange?
I'd like to know why it won't work. I know for a fact the big block and slant 6 pump arms WILL interchange. I've not had a need to swap big block for small block arms. I can also tell you big, small block AND slant 6 fuel pumps ALL have the SAME mounting pattern and excluding the pump arms, the pumps will ALL interchange onto each of the engines.....albeit the slant 6 mounts upside down to the rest. The big and small block Chevys also have the same mounting pattern as the Chrysler engines. That's why one fuel pump block off plate fits ALL those different engines. I'm sorry I cannot help with the arm swap question in your situation, but since the slant 6 and big block arms do interchange, I would try it. I'm sure you already know they won't be the same on the engine side, but I believe that's what you're looking for.
 
I’m going to try the arm swap . That has to be the only difference in the two pumps.thanks
 
I’m going to try the arm swap . That has to be the only difference in the two pumps.thanks
I believe it is. I'm sorry I couldn't verify it for you. Would you please update this when you find out? Thanks.
 
Had to read that twice but I think you may be onto something. I think it's just a pin. The block off plates are the same for LA and B/RB so the mount is probably universal but I'd check the throw of the arms. They probably are the same though at the pump end.
 
I thought the arms were two different lengths and the lever ratio was different between the two arms?

Unless we are talking about two different things.
 
I see no good reason to assume "just the arms" is all that is needed. Is the length of the actuation point on the diaphragms the same? Is the rest of the pump dimensions the same? "I don't know." There's no reason you can't buy a good capable pump for a small block Frankly, I don't "feel the love" for a mechanical pump
 
I thought the arms were two different lengths and the lever ratio was different between the two arms?

Unless we are talking about two different things.
He's not talking about the engine side being the same. He's talking about the pump side of the arms.
 
-
Back
Top