You dont need a VCV in your current application. disconnect it and chuck it away!

All you need is a vac supply to a vac switch feeding the Stop Diaphragm on the pump.

Sounds like you have the VCV plumbed in line with the Stop-diaphragm and this is causing partial Stop-Diaphragm movement, --which will limit rack-travel and fuel to engine.

There should be NO vac to the Stop-Diaphragm At All when the engine is running, and Full Vac when you want to STOP the engine.

Disconnect ALL vac-lines to confirm the engine is 'propped' right and runs as it should.

When happy, re-arrange the vac system--Without the VCV!

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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....