which fuel pump

[Cazman]

I must have threw out my old fuel pump last year when I tore my engine down.

Does anyone know which fuel pump is correct on a '68 440?
Was it one style for the HP and another for the standard engine? One of these?

 

[Davea Lux]

M3672 for nearly all applications. There was a special high volume pump for 6BBL and some high performance police applications but that probably is not yours. Use the pump cited if your inlet hose is 5/16"

Dave

 

[Cazman]

Thanks. Do you happen to know what the hi performance pump was?

I would like to upgrade to 3/8 throughout.

 

[Big_John]

Aren't you building a stroker motor?

If you are, I would take a serious look at the fuel pump they used in the 426 Hemi applications, the Carter M6903. The one shown at the top would probably be marginal for your use.

I'd upgrade to 3/8" line.

Carter M6903 Big-Block/HEMI Super Mechanical Fuel Pump

 

[Cazman]

Yea, that second pump I posted is the 6903. I thought that may be it. I still wonder what the 440 hp or police used.

 

[MEV]

My 66 newyorker 505/512 has the stock 5/16 line and a holley mechanical pump. I run 12.20@110 mph with that setup.

I run this holley pump part#12-440-11. it is internally regulated at 6.5 psi and 110gpm. I put it on because the pump on my car was the original pump installed at the factory in 1966. HOWEVER, i do not think the holley was necessary as i never ever had fuel problems and the car ran 12.50's with the stock original pump and stock 5/16 fuel line..

 

[Cazman]

I have to do the whole fuel delivery system anyway, so I may as well as go 3/8". Good information that the stock stuff can handle the extra demand.
I am going with the Carter 6903 though, even if it will not look exactly stock. Close enough for me.

 

[70bigblockdodge]

If replacing rusty lines go 3/8" factory only went 5/16 because of ease and cost. I do not like the factory pump listed first because of the inverted flare on the outlet. Every one I ever saw has about a 1/8" hole in it at a 90° bend. There is no way IMO that that can flow enough for a very strong 440 by the time it gets to 5500 RPM in 2 ND gear from a standing stop. They do make ones that look like that and have hose connections in and out. I have one like it on my Charger and Challenger and they work just fine. With a stroker you are getting into that area. I would error on the bigger pump as MEV did. Nothing worse than running out of fuel at 75 mph and the kid (or old fart)in the Subaru goes by laughing.

 

[Stern70]

I like how the gasket is the same as GM's

 

[Davea Lux]

Yea, that second pump I posted is the 6903. I thought that may be it. I still wonder what the 440 hp or police used.

Parts book shows two fuel pumps #2495528 and #2585118 which would appear to be the same pumps you have listed. The std pump is a 5/16" inlet and the high performance hemi style pump with a 3/8" inlet. The '70 parts book also shows an electric fuel pump which does not appear to be application specific #3549873.

Dave

 

[MEV]

If replacing rusty lines go 3/8" factory only went 5/16 because of ease and cost. I do not like the factory pump listed first because of the inverted flare on the outlet. Every one I ever saw has about a 1/8" hole in it at a 90° bend. There is no way IMO that that can flow enough for a very strong 440 by the time it gets to 5500 RPM in 2 ND gear from a standing stop. They do make ones that look like that and have hose connections in and out. I have one like it on my Charger and Challenger and they work just fine. With a stroker you are getting into that area. I would error on the bigger pump as MEV did. Nothing worse than running out of fuel at 75 mph and the kid (or old fart)in the Subaru goes by laughing.

Although i run the holley mechanical pump, it still have the factory 5/16 line from the tank to the pump. I just made up a section of -6 (3/8") from the pump to the carb.

 

[Cazman]

thanks, all. I ordered the Carter 6903, it is pretty much the same as the 2585118.
As Lux said "Parts book shows two fuel pumps #2495528 and #2585118"

Now, as the stub frame is out and the gas tank needs a new sending unit, should I try and run a return line? ??

 

[MEV]

thanks, all. I ordered the Carter 6903, it is pretty much the same as the 2585118.
As Lux said "Parts book shows two fuel pumps #2495528 and #2585118"

Now, as the stub frame is out and the gas tank needs a new sending unit, should I try and run a return line? ??

just use the factory 5/16 feed line for the return line.

 

[C-440-300]

I like how the gasket is the same as GM's

 

[GOLDMYN]

I have 68 HP 440 which is stock original, it uses the rebuildable pump (airtex)and also has 5/16" the entire distant to carb