Sounds like the fuel flow to the carbs is marginal. Pump is on its
way out, or perhaps the fuel filter is partially clogged, and not allowing
enough flow.
Closing the throttle allowed the pump to refill the float bowls
enough to get the power back up - until you slowly drained them on the next
long hill.
That's my $0.00002 worth.
Vance
-----Original Message-----
From: mgs-bounces at autox.team.net [mailto:mgs-bounces at autox.team.net] On
Behalf Of Douglas McKinnie
Sent: Monday, January 10, 2011 7:36 PM
To: mgs at autox.team.net
Subject: [Mgs] Carburetors
Of the twin SU variety.
<snip>
Eventually I discovered that if I let up the pedal fully and then pushed
down
again I would get the full power that I was used to, but it would eventually
bog down again. By pulsing the pedal off every so often I was able to keep
up
with any traffic I wanted to keep up with, even on the long steep uphills.
<snip>
Douglas
'70 MGB-GT
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