Skip to main content

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

Background-02

Notice to Mariners: A Blog from the SAIL Editors

As a teenager, I stumbled across a copy of Derek Lundy’s Godforsaken Sea in the back room of a used bookshop. I had never heard of the Vendée Globe and frankly found all the boat-speak in the first 50 pages a little difficult to get through. But Lundy’s storytelling and the draw ...read more

Screen-Shot-2022-01-13-at-9.26.59-AM2048x

VIDEO: Celestial Navigation Episode 2

Celestial navigation is an invaluable tool for all kinds of sailors. In episode two of the celestial navigation series, learn the basic elements of navigation and the sight reduction process using declination and GHA to determine the Geographic Position and navigate using a ...read more

Film-poster

Cruising: Year of the Sea Shanty

Along with other timeless pursuits, like baking sourdough and gardening, singing sea shanties surged back into popularity during the recent lockdown, thanks, in part, to the app TikTok and its “duet” feature, which allows singers from around the world create music together. By ...read more

Book-Cover-9780712353700

Book Review: Sailor Song

Sailor Song is the ultimate guide to the music of working sailors during the 18th and 19th centuries. The book includes lyrics and sheet music for 50 of the most beloved sea songs with fascinating historical background on the adjoining page. Chapter introductions provide ...read more

Screen Shot 2022-01-12 at 10.42.33 AM

Race Update: RORC Transat

With the fleet leaders about halfway to Grenada, the 2022 RORC Transatlantic is shaking out to be a tactically interesting one. The race, now in its 8th edition, began on Saturday with 30 teams ranging from 70-foot catamarans to a 28-foot JPK 1010. Early in the race, light winds ...read more

01-LEAD-IMG_1585

Experience: Fire Down Below

Due to the Covid-19 pandemic, local racing had resumed with household crews only. My wife, though, while always up for a pleasure sail, was not up for this kind of thing, so, for the fifth time in what was any measure an unusual sailing season, I found myself singlehanding my ...read more

BestBoats2022-logo

Best Boats 2022

In case you hadn’t heard, the fall 2021 boat show season was one for the record books. If there was ever any doubt the sailing public still enjoys making its way to Newport, Rhode Island, or Annapolis, Maryland, to see the latest in boat design, those doubts were put to rest ...read more

01-LEAD-Dominique-David-2048x

Mulithull Show Coming to La Grande-Motte

After a year without boat shows, 2021 proved to be a blockbuster summer and fall for events around the globe, and the International Mulithull Show is looking to continue that trend in 2022. First held in 2010, the show, which takes place in La Grand-Motte, France, on the shores ...read more