The Speedometer and gas gauge reading

Bayrunner

I took my boat out this weekend on the speedometer works on and off.  Ideas on how to fix it,  Also, I just want to make sure the starboard and portside gas gauge when one side read different then the other is normal.  One side 3/4 the other side 1/2 tank. 

MarkB

There's a small hole on the drive that is used to calculate the speed based on water velocity. This sometimes gets blocked. Inspect. 

What could cause your fuel consumption to be higher on one engine. Do you use it more? It's possible that they are not the same.

Michael T

@Bayrunner - Are your fuel supply valves in the same position? Where is the inter tank balancing valve positioned? Is the engine that is showing higher fuel consumption sharing a fuel tank with the generator? Is one set of props "dinged"? .....Most important has this happened before? AND - what was the attitude of the hull when the tanks were last filled. My vessel view gauges are VERY accurate. Last summer a gas dock employee said he had filled both tanks. I said there is a 30 gallon difference and my Vessel View showed it. He swore both tanks were full. He didn't want to get fired for a fuel spill so I let it go. It must have been a small air lock or just his imagination. The next time I filled the both tanks showed (and were) the same. Many times I have seen cruisers getting filled at gas docks and they are listing to one side - no way the tanks are level. ....respectfully trying to think of everything I can to help.

Bayrunner

I will check the gas valves and make sure they are balanced. Thanks MT and MarkB.

[Deleted User]

Boat speedos accurate? - KNOT!
Andy