I am wondering how much of the loping or churning or cycling on these older engines is due to pulsating nature of the fuel pressure in the IP due to the fact that the lift pump is only supplying pressure during half of the "machine cycle". That is half of every two revolutions. it is powered by an eccentric lobe on the IP which turns once for each two turns of the engine. So half the time it is pushing against a spring and half the time it is letting that spring release and deliver another pulse of fuel to the IP. So it is possible that for as much as half the machine cycle there is no refill pressure to the IP. It's just a thought. But there is no obvious mechanism to store that pressure for use during the half of the time that the eccentric is pushing against the spring in the lift pump. Then again it could be a bad rack damper bolt. But it's worth mentioning anyway.
Bogy.
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Posted by: Bogy Wan Kenobi <polespearbogy@yahoo.com>
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