Tanks two

"Our Hunter 34 has a 25-gallon fuel tank. We’d like to add a 20-gallon tank so we won’t have to carry jerry cans on deck. I estimate the two tanks will be about a foot apart. What is the best way to hook up the second tank so air can’t get in the fuel line? I’d like to avoid having to pump fuel from the new tank into the old one when it gets low. Unfortunately, there isn’t enough room to install
Author:
Updated:
Original:

"Our Hunter 34 has a 25-gallon fuel tank. We’d like to add a 20-gallon tank so we won’t have to carry jerry cans on deck. I estimate the two tanks will be about a foot apart. What is the best way to hook up the second tank so air can’t get in the fuel line? I’d like to avoid having to pump fuel from the new tank into the old one when it gets low. Unfortunately, there isn’t enough room to install one larger tank. "

-- Bill Siegworth , Beloit, Wisconsin

Don Casey replies : All you have to do is tee a supply line from the new tank into the existing line running from the old tank. You’ll need to install fuel shut-off valves between the tee and both tanks so you can use fuel from one tank without draining or filling the other. If the old tank has a shut-off valve, locate the new tee fitting downstream of it. When you want to change from the old tank to the new one, just open the new tank’s shut-off valve and close the valve on the old tank. To switch back, close the new valve and open the old one.

You could combine the tee and valves in a two-tank valve with two inlets and one outlet, but I think it’s better to have separate valves for each tank. Whatever arrangement you choose, plumbing the new tank will require breaking open the fuel-supply line, which will introduce air into the system. That means you’ll probably have to bleed the engine to make sure it will start. But once the new tank is filled, and as long as the fuel level doesn’t drop below the bottom of the pick-up tube, you shouldn’t have any problems with unwanted air getting into the system.

Related

Waypoint.image.cd

Say No To Waypoints

Ever since they first appeared in my navigational toolbox decades ago I have been wary of waypoints. They certainly do seem helpful, these electronic flags we plant in the ether to guide us to where we want to go. But I noticed early on they also tend to distort our perception. ...read more

Lead-shutterstock_429247

A Cruise up Florida’s St. Johns River

The chart showed 45ft of vertical clearance, and I knew the boat should be able to pass under the bridge. Still, there was that nagging voice in my head that wouldn’t let me be. “What if your air draft calculations were wrong?” it said. “And if you’re just a little too high the ...read more

pic00

Installing a Helm Pod

Our 1987 Pearson project boat came with an elderly but functioning Raymarine chartplotter, located belowdecks at the nav station. Since I usually sail solo or doublehanded, it was of little use down there—it needed to be near the helm. When I decided to update the plotter along ...read more

Panamerican

Pan American Game Success

Team USA’s young sailors went to the quadrennial Pan-American Games in Lima, Peru this summer with high hopes, and returned with a good haul of medals—two Golds, three Silvers, and two Bronze. Gold medals went to Ernesto Rodriguez and Hallie Schiffman (Mixed Snipe) and Riley ...read more

190916-AC75

U.S. Team Launches First America’s Cup Boat

Fast forward to around 2:25 to see the boat in action. First day out and already doing full-foiling gybes: not too shabby! Hard on the heels of the unveiling of New Zealand’s first AC75, the New York Yacht Club’s American Magic team has now launched its first America’s Cup ...read more

GGTobCaysHorseshoeColors

Picking a Charter Destination

Picking a destination should reflect the interests of your group, says People often ask about my favorite charter destination, and invariably, I sidestep the question with one of my own: “Well, what do you want to do on your vacation?” Most often I hear an incredulous, “Why, ...read more

sinking

Waterlines: Chasing Leaks on Boats

Chasing leaks on boats is a time-honored obsession. Rule number one in all galaxies of the nautical universe through all of nautical history has always been the same: keep the water on the outside. When water somehow finds its way inside and you don’t know where it’s coming ...read more

BestBoatNominees2020-Promo

Best Boats Nominees 2020

Bring on the monohulls! In a world increasingly given over to multihull sailing, SAIL magazine’s “Best Boats” class of 2020 brings with it a strong new group of keelboats, including everything from luxury cruisers nipping at the heels of their mega-yacht brethren to a number of ...read more