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Original post by: Van.hee.dan ,

Text:

i FOUND OUT ACCIDENTALLY THAT THERES A UPGRADE TO THE FUEL PUMP SPRING. i BOUGHT IT, INSTALLED IT IN MINUTES  AND IT BOOSTED MY FUEL PRESSURE TO THE POINT WHERE MY ENGINE IS RUNNING CONSIDERABLY BETTER. i HAD THE SAME THING GOING ON WITH MY C15  6NZ.

Parts guy at CAT said alot of guys with 6nz engines are being wrongly told the fuel psi should be 95 psi, when in fact it should be 115 psi for a 6NZ. Now im running 125 PSI and its much much better.

The spring is hugely over priced, its a darn spring the  diameter of a pencil under 3 inches long (but it comes with a new cap plug….WOW.. NOW ITS WORTH THE $93… “ NOT”…. (but it works..try it )

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