[Tigers] Fuel Pump Question

[Tom Parker]

Jay,

I'm certainly not an expert... I had a Holley fuel pump on the Kitty with a
fuel filter before the pump; the pump stopped working, so I removed the
filter and it worked fine (but it was loud, so I replaced it with the old
Bendix...). Fuel pressure if I recall correctly is @ 3 to 5 lbs. This from
Holly on the 4160, as I remember it.  Anyhow, 5 PSI should be fine.

Maybe timing, or a loose vacuum line to the distributor? If the motor runs
o.k. at speed and accelerates o.k. it probably isn't fuel pressure related.
(but it could be a carb adjustment...)

Tom
'67 Mark 2


On Fri, May 30, 2014 at 3:41 PM, Jay Laifman <jay.laifman at gmail.com> wrote:

> I rebuilt the stock pump and it was working fine.  It failed.  I grabbed a
> new
> Carter vane type pump I happened to have from another car and threw it in.
>  It
> worked for a short while then failed.  Then I grabbed one last Facet pump I
> happened to have.  It is working, and still working.  But the car is now
> not
> running perfectly.  I don't know if it is related to the fuel pump.  But
> I've
> only noticed it since I change fuel pumps - and changed the spark plugs and
> wires.
>
> I put a fuel pressure gauge on and found that this pump is putting out 4.25
> psi.  I've looked around and have seen that 5.5-6 psi is suggested - but I
> can't confirm if that is correct for a 260 with a Holley.
>
> The problem I'm having is that I'm getting a little stumble on initial
> acceleration and I've noticed when I take my foot off the gas, like to
> shift
> up, the rpm drops all the way to 0, but does catch up again.
>
> One thought was that this fuel pump doesn't have enough volume for the
> carb/engine - or different enough volume that the float bowl is not at the
> same level as it was with the old pump.  But I don't know if that make
> sense.
>
> Another thought was that the accelerator pump is not putting out enough
> fuel.
> But, I haven't changed the accelerator pump and that wouldn't explain the
> far
> drop to 0 when lifting off the gas.  Although I don't know for sure if the
> two
> are related.
>
> Thanks for any thoughts.
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