In reconnecting the fuel system on my 66 TR4A, I have discovered a
potential problem. When I pump the priming lever on the fuel pump,
or even crank over the engine with the starter, I can force fuel to
spray out of the float chamber vent holes (I have HS6 SU carbs).
I inspected the floats and valves, and they appear fine. I didn't
notice a problem like this when I began the restoration, but that was
over a year ago. I have reinstalled the original fuel pump, which I
rebuilt (replaced aftermarket pump w/o priming lever).
The "spray" is mostly from the forward carb (which the fuel goes to
first), but the rear carb will also do it.
Questions-
1. Is it possible the I have too much pressure from the
fuel pump? I thought this might be the case at first,
since it takes a bit of pressure on the priming lever
to get it to spray (I was trying to test the fuel line
connections). But it also happens when I crank the
engine with the starter.
2. Is this a common failure mode for the float valves? If
so, would groose-jets be better?
--
Darrell Walker walker@hprpcd.hp.com
(916) 785-4059 HPDesk: walker (hprpcd) /HP5200/UX
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