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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
The actual allen head spring tension differential pressure adjustment for flow adjustment to that injector is under that allen head button head screw
Unscrew it you'll see it under there. If it's rusty put some spray lube on it first.

The button head cover is 4mm allen head and the flow adjuster is 3mm allen head if I remember correctly. Either way use the metric allen head wrench that fits right.

Small adjustments to the adjuster allen head make a noticable difference so go slow with patience..

good luck!

edit: I forgot to mention turning the allen head flow adjuster clockwise increases spring pressure pushing the diaphram that seperates the upper and lower chambers in the fuel head downward away from the metering orifice above it increasing flow to that injector. And of course turning it counterclockwise lowers spring tension allowing lower chamber differential (system) pressure to push the diaphram upwards against the orifice which lessens flow to that injector.

It's kind of like a small final fuel pressure regulator to fine tune the amount of flow going to each individual injector.

Last edited by JFairman; 03-18-2014 at 09:11 AM..
Old 03-18-2014, 08:55 AM
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