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Fuel pump replacement
https://www.slantsix.org/forum/viewtopic.php?t=36089		 Page 1 of 1
Author:  mouseworks [ Fri Jul 03, 2009 3:34 am ]
Post subject:  Fuel pump replacement
Hi folks

I have been following your old threads on replacing standard slant six pumps with BB units and changing the lever. Unfortunately, the Carter pump I have purchased - M5903P - will not work with this mod.

When I lay the S6 pump lever over the new pump with the pivot holes lined up, the arm is not long enough to engage the diaphragm rod.

So, are there different versions of BB fuel pumps or should I try something that looks to have the pump body closer to the block - like AMC?

Any help much appreciated.
Author:  SlantSixDan [ Fri Jul 03, 2009 8:51 am ]
Post subject: 
What kind of setup are you putting together that needs such an enormous volume of fuel…?
Author:  mouseworks [ Fri Jul 03, 2009 7:47 pm ]
Post subject: 
Hi! It's not so much the amount of fuel but the fact that replacement pumps are not available - only the really poor chinese "pressed metal" ones. I have had 2 of these fail - the "towers" came away from the base with a shower of fuel everywhere.
The first pump to do this was only 3 weeks old...

I will sell the big block pumps and try another.

I have found one unit - the Carter M904P - which looks to have the same distance from the diaphragm centreline to the pivot point. This is a Ford unit with a flow rate of 5.5 to 6.5 so it is not too high.

So, which models have been converted successfully? This would save me ordering more pumps that don't convert..
Author:  SlantSixDan [ Fri Jul 03, 2009 8:00 pm ]
Post subject: 
Hooray for Chinese fuel pumps...not. :roll:


I am pretty sure to do this swap successfully (big block pump onto slant-6) you need to start with an original-equipment '60-'63 slant-6 fuel pump, which is a bolt-together Carter, and get the arm from that one. The problem is, all those big block pumps give pressure much higher than a stock (or anywhere-near-stock) slant-6 wants. You'll wind up with big, obnoxious flooding problems.

The easiest thing to do is probably to pick up a new old stock bolt-together slant-6 fuel pump (they go by on ebay all the time or you might find one at Old Car Parts Northwest ) and put an alcohol-proof rebuild kit in it from www.then-now.com .
Author:  mouseworks [ Fri Jul 03, 2009 11:39 pm ]
Post subject: 
Thanks for the leads. I probably will have to try Then & Now. I do have a Slant Six pump lever - but not from a slant six.

In Australia, we had both the slant six and the later hemi 6 engine - both using the same pump up until 1974 or perhaps a bit later. The problem with the hemi 6 is that it used a bit more fuel - a pump pressure of 5.5 - 6.5 lbs when running multiple carburettors - triple webers.

Though the Webers can only use 3.5lbs of pressure, they worked fine out of the factory with the higher pressure pump and no regulator. No flooding. To get an even higher pressure than the standard pump intended for 2 barrel carbs, they changed the diaphragm to a 318 v8 one.

Trouble is that if you use a 318 one now, the bolt holes do not line up as the new replacement 318 ones have a larger diaphragm. Originally, all they did was use a 318 spring on a 6 cylinder diaphragm.
Standard 6 cylinder rebuild kits are available here but the quality is not good.

Hence the idea of using a new pump. I will try Then and Now to see if they can make a sutable kit but it would be handy to know which new pump has been used with the lever modification.

It is amazing how many slant six powered Chyslers are still running here and the prices they are now getting... They have even cast a new inlet manifold - reversible with 4 barrel on top and two barrel flange below.
Author:  66aCUDA [ Sat Jul 04, 2009 6:00 am ]
Post subject: 
Quote:
They have even cast a new inlet manifold - reversible with 4 barrel on top and two barrel flange below.
I would LOVE to see a picture of this. Welcome to the Forum.
Frank
Author:  mouseworks [ Tue Jul 07, 2009 4:16 am ]
Post subject: 
For further details of the manifold:

http://www.pentastarparts.com.au/sunsho ... ail&p=2555
Author:  SlantSixDan [ Tue Jul 07, 2009 5:38 am ]
Post subject: 
That's the Hurricane manifold, been discussed (and dissected!) here on the board for quite some time. Not sure what "2-barrel flange below 4-barrel flange" thing you're talking about, tho. It's a 4-barrel intake.
Author:  mouseworks [ Wed Jul 08, 2009 2:13 am ]
Post subject: 
The manifold has a 4 barrel flange on one surface and a two barrel flange on the other.
Which side is on top is determined by choice of carburettor.
Author:  Joshie225 [ Wed Jul 08, 2009 3:37 am ]
Post subject: 
1. There are different Hurricane manifolds for 2 and 4 bbl use.
2. You cannot mount a slant 6 intake manifold upside down.
3. Some manifolds have interchangeable tops to accommodate different carburetors.

I really feel you should put the pipe down at least an hour, preferably two, before you sit down at the keyboard.
Author:  66aCUDA [ Wed Jul 08, 2009 5:37 am ]
Post subject: 
Hey guys I think he is talking about the water heat provision as was discussed on here in the original Aussie manifold thread. I guess it might be thought of as a covered 2 bbl mount to a layman.
Frank
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