[Tigers] Fuel pump question

[genepadgett at comcast.net]

Allan, my guess is that its at least partly aB carb float shutoff problem. As
I understand it the SU pumps supply fuel "on demand". So if the bowls fill and
the shutoff valves do not shut off the flow, the pump will keep pumping.B B 
Obviously, that would not explain a situation where the key was off and the
pump kept pumping, but you probably would have heard it continuing to tick if
that was the case.Perhaps it is wired in a way that has power to it directly
rather than through the switch?



Those are the first two things I would check anyway. Hope it turns out to be
an easy fix.



Gene





---- Original Message -----
From: "Allan Ballard" <allanballard at att.net>
To: "LIST TIGER" <tigers at autox.team.net>
Sent: Monday, April 18, 2011 5:15:19 PM
Subject: [Tigers] Fuel pump question

Under what circumstances would a stock fuel pump - pump gallons of gas into
the motor?

My new motor spun a cam bearing; the rebuilder said the fuel pump pumped the
gas tank dry, into
the motor.

I will guess that the oil thinned accordingly, and that's why it was idling at
230F, and that's why it spun a
bearing - but how could that happen...?

Would leaving the ignition switched on, or perhaps an electrical short, do
that?

I run a replacement pump from Sunbeam Classics, the version without points,
and an Edlebrock 500 cfm 4 bbl carb. Both have less than 4,000 miles.

Meanwhile the new engine comes back out to receive all new bearings, possibly
will need to replace the camshaft as well.


Allan Ballard
Mk1a Tiger
SIV Alpine
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