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If the VST tank has water or its filter is clogged you will get the same symptoms. Regardless of whether you have a separate portable fuel tank or not. Debris and clogging and water can be downstream of both of the main filters. Recommend you change VST filter drain VST and that may solve your...

Food grade silicon spray if worried about the bait!

Are you sure it is the FW pump? If it's the washdown pump, then the washdown switch on the helm panel is on. Troubleshoot by turning off all DC switches except the master and then turn on the FW switch and open a tap. If it happens with the helm panel switch, then someone has added wires to...

There is also a pressure switch associated with the pump that can be sticky so I wouldn’t write the pump off until I’ve checked the pressure switch. It is designed to turn off the water flow and the pump at a certain pressure and turn it back on when the pressure drops.

New Wire Marine has switches covers etc. and explanations of each. No affiliation, but great website and service. https://newwiremarine.com/

Don’t know about the 305, but the 330 is doable but not easy. Make sure to replace the screws with studs to allow much easier placement of the wing nuts. You use a Allen wrench to thread the wing nuts onto the studs. There are numerous posts with advice, I provided pictures of the replacement...

Remember the quantity will change significantly based on the Boats pitch attitude. Therefore mostly inaccurate unless calibrated to a specific pitch attitude. One way to calculate: each bar graph has 10 segments, one segment equals 1/10 of the total capacity, in my case main = 300 gallons each...

Check the wiring diagram in your owners manual. The switch is located just underneath the gunnel starboard side all the way out towards the tuna door inside the rod holder area. It is up and under the gunnel.

Galvanic isolator switch under the starboard gunnel aft ?

Fuel remaining can be quite accurate if you remember to reset your on board fuel every time you refuel and if you can figure out exactly how much is on board when you reset. It doesn’t use gauge readings for fuel remaining calculations. It is only as accurate as your initial input which can be...

Can’t remember exactly. Recommend you get the manual and start from scratch reprogramming what you’d like to see. The fuel remaining is strictly a subtraction problem from when you set fuel on board. Doesn’t read directly off the tanks. Tank levels are graph gauges on the right side. Left being...

330. Same. One engine from each tank. Provides reliability and redundancy just like aircraft always do!

Edson!

On my 2007 330 the left most bar is the main (aft) tank and the right is the aux or forward tank. I believe it is a function of the yamaha gauge setup, but GW usually makes left main. No switch on my boat.

One of the most common problems that can produce similar symptoms are intermittently clogging the VST filters. Just had similar problem with a 150 that had debris in the VST and the filter would clog intermittently. If the filters have not been changed since new it’s always a good thing to do...

Yamaha tachs do not show trim tabs they show engine trim.

I don’t think that will be simple. Be real careful. Taking a parallel bank and turning it into a series bank will require additional switching as well taking a parallel battery out of a parallel bank and adding it to your other two series. Lots of opportunity to fry things. Remember to get a...

Don't know what grill they are installing, but you can contact GW customer service and they can tell you.

I've thought about a trolling device also, but in most conditions, I don't believe it would work very well given the weight and sail area of the 330. At the very least it would require a 36 volt source. Any wind or current would likely overpower a trolling motor and with any seas the prop would...

A battery can show good voltage and still be weak. Check it with 100 amp load meter (cheap at Harbor freight or any auto parts store can check it for you.) See if it maintains voltage. I just had a battery that showed 12.7 V after a day of sitting but when the load was applied voltage went...