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boost reference fuel pump
https://slantsix.org/forum/viewtopic.php?t=16401		 Page 1 of 1
Author:  finnman1 [ Thu Mar 02, 2006 10:17 am ]
Post subject:  boost reference fuel pump
i need to boost reference my fuel pump diaphram. can anyone give me a description of EXACTLY where the 'weep' hole is to tap a 1/8" pipe thread? thanks
Author:  Doctor Dodge [ Mon Mar 06, 2006 11:32 pm ]
Post subject: 
Most pump vents are in the main pump body casting, most have a "loop" or ring of casting material over the hole. the top of the loop must be removed to tap the hole out.
http://www.dutra.org/pictures/engine/fuel-pump-vent.jpg
DD
Author:  finnman1 [ Tue Mar 07, 2006 10:31 am ]
Post subject: 
i'm running a draw-thru so this wont be necessary as the vacuum will help. I was wrong, thanks for the pic though.
Author:  SlantSixDan [ Tue Mar 07, 2006 10:50 am ]
Post subject: 
Quote:
Image
Interesting image, Doug. Looks like one of the early '60s high-volume V8 fuel pumps (with dual valves), but with the \6 operating lever. I've thought about this combo but never deeply enough to work out how I'd cut the pressure down from the V8's 8-9 psi down to the \6 operating range of 3-4psi. Care to tell us more about this pump?
Author:  Doctor Dodge [ Thu Mar 09, 2006 11:02 pm ]
Post subject: 
Quote:
Interesting image, Doug. Looks like one of the early '60s
high-volume V8 fuel pumps (with dual valves),
but with the \6 operating lever.
I've thought about this combo but never deeply enough to work out how
I'd cut the pressure down from the V8's 8-9 psi down to the \6 operation
range of 3-4psi. Care to tell us more about this pump?
This is exactly what it is, an HV Big Block Mopar pump with a SL6 lever swapped-in.
It puts-out 7-8 psi and I use two different regulators to control the fuel pressure.
4 to 5 psi to the Holley 600 carb. and 5 to 6 psi to the NOS system.
This pumps feeds both systems with-out a problem.
It is too much pump for a "carb only" application.
Author:  blownhemi [ Fri Mar 10, 2006 12:36 am ]
Post subject: 
If you're running it in an NA application, why does it have a boost reference?


Does it really supply enough for nitrous? How much gas did you run with it?
Author:  Doctor Dodge [ Fri Mar 10, 2006 1:33 am ]
Post subject: 
I installed the boost ref. fitting when I built the pump but as you pointed out, don't need it at the moment.
It does not take much to tap the hole and install the fitting so it's there if I ever need it.

Currently I have a 100 HP system, I would like to try a 150 HP shot.
I recently added an electric pump back at the tank for extra "insurance" and to prime the engine for faster starts after it has sat for a while.
DD
Author:  blownhemi [ Fri Mar 10, 2006 3:58 am ]
Post subject: 
How long have you run the 100hp shot with just the mechanical pump?

I think I'd like to give it a shot.

Did you run enlarged fuel lines or anything or was it with stock 5/16 fuel line?
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