Moparts

Replacing Mechanical Fuel Pump on BB Motor.

Posted By: Anonymous

Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 02:46 AM

Hi,
I am just starting out on Mopar mechanics, and would like to replace the fuel pump on a '70 440 motor. I would appreciate if anyone can let me know if I'm overlooking anything here..

The removal/replacement of this looks fairly straightforward -- I just unhook the fuel lines and unbolt the pump off the motor. Then, for re-install, after cleaning the old gasket material from the mating surface on the block, put a new gasket with sealer and bolt the new one in and re-hook up fuel lines.

Is that it, or am I overlooking something? Are there any special settings to make when inserting the mechanical lever for the pump into the block?

Also, do you guys have any recommendations for a good stock replacement pump? Would a Carter or Holley pump be best? I would like to maintain stock psi, as I am not running any fuel regulators, etc.

Thanks very much for any help!

--Dave
Posted By: DirectSubjection

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 02:51 AM

Between the pump and the cam there is a small little rod connecting the two, you might want to replace that while you're there if its a high mileaage motor.
Posted By: forphorty

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 03:05 AM

the fuel pump pushrod may try to slide down. take out the plug below the fuel pump and poke something up there to hold the rod in position while you feed the pump arm in.
Posted By: therocks

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 10:42 AM

Yeag watch the rod.Ive seen a bunch installed that dont work because they didnt get the rod on the pump arm.Also make sure the cam is at it furthest position so the rod isnt putting a lot of pressure on the pum arm.I use Holleys.Had 4 bad Carters in a row.That made me go back to the Holley pump.Rocky
Posted By: KMPX2

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 12:03 PM

Quote:

the fuel pump pushrod may try to slide down. take out the plug below the fuel pump and poke something up there to hold the rod in position while you feed the pump arm in.




This is the best info you need.
Posted By: VanishPt

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 03:41 PM

dip the cam end of the pushrod in some grease and put it back in the hole . The grease will help hold it in place while you slide the pump arm into position.
Posted By: Mobarge

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/09/08 04:35 PM

Quote:

Quote:

the fuel pump pushrod may try to slide down. take out the plug below the fuel pump and poke something up there to hold the rod in position while you feed the pump arm in.




This is the best info you need.




+1 on that. I'm running the Carter pump with no problems. It's a high volume, low pressure pump (120 GPH, 6 PSI), and it's rock steady.
Posted By: Chilort

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/12/08 11:56 AM

I am getting ready to do this job myself. Thanks for the great info. Luckily, I also have the oil pan off right now too, so I can get at things from both sides.
Posted By: Dads426

Re: Replacing Mechanical Fuel Pump on BB Motor. - 08/12/08 12:29 PM

I have the Carter high volume mechanical on the 64 and it works great. We are using a Carter low pressure pusher pump because it is mostly a drag car. Just be careful of the fittings on the pump. Be sure that you know the difference between a NPT (pipe) fitting and flare fitting. They are not interchangeable, but there are adapters to go from one to the other.
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