Allan
The stock fuel pump is an on demand type electrical fuel pump.
When the pressure in the line reaches a certain point the pump shuts off.
The floats in the carb determine if there is a demand for fuel. If a float
no longer floats or it is hung up somehow in the fuel bowl the pump will
pump fuel until it runs out of liquid or burns out.
Yes leaving the ignition ON would also leave the fuel pump ON. You
need to check the feed wire to the pump to make sure it is not always 12V;
it must be switched by the ignition switch. I would think you would hear
the pump always running if there was always 12V to the pump. The ignition
switch could also be bad or there are poor connections there.
You also need to check the carb floats for a problem. I don't
think there is any other path for the fuel in this type carb but I'm not
that familiar with your carb.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Allan Ballard
Sent: Monday, April 18, 2011 6:15 PM
To: LIST TIGER
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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