[Tigers] Fuel Pressure

[Ron Fraser]

Joel
	You could drop the float level a little to see if it helps.  Make
sure the float does float and not sink.
Float level is away check wet.

Ford carburetors operate around 5 psi and I believe up to around 8 psi

Leaks are always a pain but you need to find where and why it is leaking -
is the gasket leaking, is the float level too high, is the needle and seat
OK, is it the casting?

At WOT you need about 1/2 lb fuel per HP - 15 gph will support around 200
HP; 36 gph should support around 480 HP

Ron Fraser


-----Original Message-----
From: tigers-bounces at autox.team.net [mailto:tigers-bounces at autox.team.net]
On Behalf Of Joel Martin
Sent: Tuesday, June 18, 2013 3:46 PM
To: tigers at autox.team.net
Subject: [Tigers] Fuel Pressure


> I am having issues with my rebuilt
> Autolite 4100 4 barrel on the 1965 Ford 289 HiPo engine with > about
271 HP and 5/16" fuel line.  The > passenger side secondary is
filling up with gas at idle and > then leaking out the side.  I have
checked float level, > same as primary.  No dirt etc in needle and seat.
> I am  thinking I have too much fuel pressure and fuel
> is pushing past the needle and seat.
>
> I have disconnected the fuel line from carb and with
> pressure guage on line, I have 5.52 lbs of pressure.
> My understanding was that the 4100 needles were good to 8 > lbs
before fuel would push past needle and seats.  When > the pump gets to
5.52 lbs with only the pressure guage > connected the pump stops ticking,
when connected to the carb > it never stops ticking\pumping > >
I purchase the Facet fuel pump Part Number: BK 6101074 > Product Line:
Balkamp > Attributes: > Fuel Pump Fitting Type[s] : 5/16" Barb
Elbow > Fuel Pump Gallons Per Hour : 36 gph > Fuel Pump Line Size :
5/16" > Fuel Pump Pressure Rating : 4 - 5.5 psi > > My
understanding was that the 4100 needles were good to 8 > lbs before fuel
would push past needle and seats.  The > stock SU pumped 15 GPH and would
support 200 HP, at least to > my understanding - no idea of the PSI?
What > PSI\GPH is needed to support the 271 HP engine? > > The
only thing I can think to do is purchase a fuel > regulator and choke
down the PSI until secondary stops > pushing gas past the needle and
seat. > > Any ideas would be appreciated. > > Joel Martin >
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