Mechanical fuel pumps

[6packCuda]

I need to get a new fuel pump for the Cuda. There's a large variety to choose from. Does anybody have any recomendations for which one to use? I have a 451 with a mild cam and a six pack. Nothing radical.

[MEK-Dangerfield]

This is what I have, although the pic in the ad is of a small block pump. 


  Mike

http://store.summitracing.com/partdetail.asp?autofilter=1&part=CRT%2DM6903&N=700+4294908110+4294840062+115&autoview=sku

[Jacksboys]

I have a smallblock, but I have had good luck with the Carter brand also.

[Chryco Psycho]

I use a lot of those pumps , you will need 2 brass fittings [1/4" pipe] to connect the lines to

[Dave-R]

I use the same pump but converted it to fit 3/8ths NPT and -8AN fittings so it hooks up easily with the rest of my -8AN fuel plumbing.

There are two trouble spots with this conversion.

The first is that one of the threaded holes has to be milled so that the new hole is offset from the center of the old hole. Otherwise the bigger hole would go through the pump body on one side.

The other problem I had was theading the hole deep enough. I had to grind some off the end of the 3/8 tap so that it would go in far enough to seal OK.

I have used it for a few years like this and it works fine.

[kudakidd]

Carter. Reliable and the best bang for the buck.

[6packCuda]

Well, I ordered the Carter pump that everybody recommended, which was the same as what I already had. After installing the new pump, the car wouldn't run at all. I re- installed the pump two more times to make sure I had the rod on the lever like it's supposed to be. Still nothing. So, I returned the pump to Summit and had them send me another one. Same part #. Guess what, same problem. Car won't run. So, I put the old pump back on and the car runs. It just runs out of gas on heavy acceleration. So, I sent the second pump back and had them send me a Holley pump. It will be a couple weeks before I have time to try it out. Is it possible that Summit sent me two bad pumps in a row, or am I missing something here?

[Chryco Psycho]

have you checked the fuel pump pushrod & cam for wear ??
 if they are worn the pump will not fully cycle

[MEK-Dangerfield]

have you checked the fuel pump pushrod & cam for wear ??
 if they are worn the pump will not fully cycle

   

I had that problem. My pump pushrod was worn about 1/4". It should be somewhat difficult to mount your pump to the block, as the pushrod doesn't want to play nice. If that isn't the problem, then it sounds like something else in the fuel line is limiting your fuel pressure.


  Mike

[6packCuda]

I was thinking the same thing, but couldn't get the pushrod to come out. Anybody have any tricks to get it out without tearing down the engine?

[NotaHemi]

Why not just go electric?

[6packCuda]

Why not just go electric?

If I still have the same problem after installing the holley, I will go with an electric one.

[MEK-Dangerfield]

I was thinking the same thing, but couldn't get the pushrod to come out. Anybody have any tricks to get it out without tearing down the engine?

It wouldn't come out?? That's the easy part. There is a big Allen-head nut on the block that lets the pushrod slide out after you have removed the fuel pump. It's on the bottom corner of the block.

  Mike

[drag-n-cuda]

6packCuda,
     I'll empty my float bowls on my 395+ cid sb on the top end with a Carter mechanical.  Between the hand bent 3/8" aluminum line and the hard acceleration, the pump just can't keep up.  Are you running hard line or braided.  Many bends in hard lines will cause volume loss at the carb.  Smoother bending braided lines may help.  I wish someone made the 150-160 gallon mechanical for Mopars like they do for Chebby & Fird.  If I go electric will probably use an Aeromotive pump.

my $.02,
drag-n

[6packCuda]

It wouldn't come out?? That's the easy part. There is a big Allen-head nut on the block that lets the pushrod slide out after you have removed the fuel pump. It's on the bottom corner of the block.

  Mike

Yeah, I took out that Allen-head nut, but the rod would not slide out. I think the rod is boogered up where it makes contact with the cam and that's preventing it from sliding out.