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DBabbitt DBabbitt is offline
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Join Date: Sep 2017
Posts: 21
CIS Injection Loses Pressure

In my 1978 VW Rabbit with CIS, 4 cylinder, from Canada and minimum emission controls, I'm loosing pressure overnight so that it takes 1/2 mile of road driving to clear the "air" from the system. I've changed fuel pump check valve several times and disassembled the fuel distributor's pressure relief to inspect. I've checked fuel injectors that they open/close with pop/seal as well as the 5th injector. I've replaced the fuel system accumulator.

Could I be loosing fuel past the fuel metering plunger in the barrel? Could CIS-Jetronics do something in that area? What if the slots in the barrel are misformed?

By the way, VW said to never open the fuel distributor and I know why, hard to seal. What works is a homemade gasket made of 0.001" aluminum foil that fits agains the metering diaphragm.

Old 09-28-2017, 06:36 PM
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