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cummins414

Airdog I FP-150

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Whats all involved in changing the fuel pressure setting on the Airdog I FP-150

Putting a washer or two with a hole in it behind the spring on the pressure relief valve to increase the pressure. The hole is to let the fuel through.
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Yeap... 1. Shim the spring.2. Get a different spring.3. Or stretch it out (not suggested) You might notice the problem I see every year or so the plastic check ball wedges down into the coil of the spring reducing the pressure. Just pull the spring back out of the coil and re-install and usually you'll see a 1-2 PSI gain.

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