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Old 03-05-2021, 10:55 AM   #1
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Equalize fuel level in Grand Banks Trawler

Does anyone know the fuel valve settings to equalize fuel in the tanks of a 1978 Grand Banks 36 Trawler?
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Old 03-05-2021, 11:00 AM   #2
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There should be a fuel line that just connects the two tanks and doesn't go anywhere else. May have an on/off valve on both ends. Open them both. Fuel level in both tanks will eventually equalize, though it may take awhile.
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Old 03-05-2021, 11:34 AM   #3
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Both of my tanks go to a valve board from a shut off at tank, there is a shutoff again for both and then it goes to filters. The cross flow has a tap between those two which allows constant equalising or feeding to opposite side engine.
If you post a picture of outlet from tank and your valve board may be able to see if yours is similar
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Old 03-05-2021, 11:37 AM   #4
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Quote:
Originally Posted by Oldersalt View Post
There should be a fuel line that just connects the two tanks and doesn't go anywhere else. May have an on/off valve on both ends. Open them both. Fuel level in both tanks will eventually equalize, though it may take awhile.
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That is what I thought until having closer look. Now thinking about it the crossflow is raised at about 1/2 tank full. Does that mean gravity will no longer crossflow if both tanks are below that level. If done on purpose i like it as no need then and less sediment transfer would be possible
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Old 03-05-2021, 02:37 PM   #5
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Below is a picture of the ER of my earlier boat, a 1979 GB Cl.

In the middle of the picture, below the generator are two diamond-shaped valves. If I recall correctly, one of these would direct the diesel from one or the other tank to the generator. The other did the same for the return to the tanks.

In between them, and hard to see in the picture, is a valve with a lever which could be opened to connect the two tanks and level them.
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Old 03-05-2021, 03:22 PM   #6
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Quote:
Originally Posted by Oldersalt View Post
There should be a fuel line that just connects the two tanks and doesn't go anywhere else. May have an on/off valve on both ends. Open them both. Fuel level in both tanks will eventually equalize, though it may take awhile.
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Mine is set up the same way. The cross over pulls from a valve at the bottom of each tank.
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Old 03-05-2021, 03:24 PM   #7
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Mine looks the same but is located on the side of SB tank about 1/2 way up
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Old 03-05-2021, 03:29 PM   #8
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Mine looks the same but is located on the side of SB tank about 1/2 way up
That seems odd? What about the port side?
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Old 03-05-2021, 06:02 PM   #9
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That seems odd? What about the port side?
Take yours and move it to face of SB 1/2up. Port comes over to it
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Old 03-05-2021, 08:24 PM   #10
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Why? If to trim a list and your boat is not trimmed correctly in the first place, opening the crossover valve will likely make the list worse.

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