5 hours ago, justgary said:

I guess that might be the most common failure mode.  The OP asked how to tell the difference between bad pump and bad regulator.  I explained a way to test.

My thought is generally that if a test is easy enough to rig up and perform, it makes sense to do it rather than just throw parts at the problem.

 

As you said, I don’t like throwing parts at a problem but I don’t think I have the right noses to rig the gauge right off the pump discharge and keep the rest of the system piped in to run the engine. The boat is 25 years old so maybe it’s time to replace both. 

5 hours ago, hmh800 said:

I thought if regulator was bad fuel pressure would be high?

hmm, I am no mechanic. It makes sense if the regulator was stuck closed pressure would go high. This leads to the question, does the regulator have a large enough diameter that if it was stuck full open would it flow so much fuel back to the tank that pressure would go low? 

On 5/23/2026 at 12:47 PM, shagens said:

Doing it today acutally

this is awesome! How about a thorough update ?

The power wedge will not normally stow using the dash control pad buttons unless the speedometer is reading between 1 and 5 MPH, unless you bypass the speed control limits by using the wedge service screen.  The dash pad buttons and sport pad send data on the ACC CAN to the Viper display and IO module to control the wedge, so it is very unlikely that they are the problem if you can use them to control the wedge at all.  The wedge sensor is connected to the IO module which sends the sensor data on the ACC CAN.  The wedge service screen with show the sensor voltage so you can see if it is reading correctly. The 6-pack relay box receives signals from the IO module and sends voltage to the proper wire of the power wedge motor to make the actuator extend or retract. 

Poor ground connections, loose connections on the wedge breakers, problems with the 6-pack relay, or physical damage to the power wedge could cause that kind of issue as well.  The wedge sensor harness can be repinned to use the secondary internal sensor if there is a problem with the primary sensor, but there are no other sensor adjustments on the Power Wedge III.

When replacing mine, I was concerned for the same reason.  I picked one up off eBay.

LINK: Fuel Tank Anti Siphon Gas Valve 1/2 Hose Barb , 1/2 Npt Thread Made In USA

Good luck with your project.