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Old 14-01-2021, 10:10   #1
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New fuel tank - Connections on top vs side?

Im just in the process messuring for new fuel tanks...and I guess best would be to put em on high on one of the sides. Do u see any problem doing this? Mainly so I could maximize the volume (cause it's already very small).

The plan is to put two tanks in the bilge, one on each side of a stringer.
They will both be sharing the same fill up hose.
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Old 14-01-2021, 10:19   #2
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Re: New fuel tank - Connections on top vs side?

Diesel or gasoline? Under ABYC/USCG you can put the diesel outlet where you wish (mine is gravity feed), but gasoline has to be lifted out the top.
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Old 14-01-2021, 10:21   #3
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Re: New fuel tank - Connections on top vs side?

I think if the connection fails you don't want the fuel pouring out.
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Old 14-01-2021, 10:41   #4
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Re: New fuel tank - Connections on top vs side?

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Originally Posted by tkeithlu View Post
Diesel or gasoline? Under ABYC/USCG you can put the diesel outlet where you wish (mine is gravity feed), but gasoline has to be lifted out the top.
It's diesel
Gravity fed is nice...but always the risk if connections fails
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Old 14-01-2021, 10:55   #5
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Re: New fuel tank - Connections on top vs side?

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I think if the connection fails you don't want the fuel pouring out.
True...but if Im putting the connections on the side...I was more thinking as high as possible...still a risk of pouring...but not the whole tank at least
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Old 14-01-2021, 13:36   #6
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Re: New fuel tank - Connections on top vs side?

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Originally Posted by andreas.mehlin View Post
True...but if Im putting the connections on the side...I was more thinking as high as possible...still a risk of pouring...but not the whole tank at least

We have connection on the bottom ( diesel ) with an ss ball valve but have no idea of insurance requirements.
Used to build white spirits industrial tanks & they had outlets on the bottom.
The risk of a welded ss socket with an ss nipple, ball valve & hosetail failing is much less risky than boating IMO
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Old 14-01-2021, 18:00   #7
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Re: New fuel tank - Connections on top vs side?

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Diesel or gasoline? Under ABYC/USCG you can put the diesel outlet where you wish (mine is gravity feed), but gasoline has to be lifted out the top.
Which is a bit challenging because all the fuel pumps seem to be “pushers”, rather than “pullers.”

This has been a weakness in my fuel system design from day 1. Hard to draw that gasoline out of the tank.
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Old 14-01-2021, 22:38   #8
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Re: New fuel tank - Connections on top vs side?

Quote:
Originally Posted by andreas.mehlin View Post
Im just in the process messuring for new fuel tanks...and I guess best would be to put em on high on one of the sides. Do u see any problem doing this? Mainly so I could maximize the volume (cause it's already very small).

The plan is to put two tanks in the bilge, one on each side of a stringer.
They will both be sharing the same fill up hose.
If interested send me an email ... boatpoker@gmail.com ... and I'll respond with a pdf of the ABYC diesel fuel systems standard.
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Old 15-01-2021, 13:04   #9
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Re: New fuel tank - Connections on top vs side?

It doesn’t matter whether the fuel tank is tapped on the top or bottom as far as fuel draw effort. Only the elevation of the top of the fuel in relation to the elevation of the pump. Physics.
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Old 15-01-2021, 13:21   #10
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Re: New fuel tank - Connections on top vs side?

"It doesn’t matter whether the fuel tank is tapped on the top or bottom as far as fuel draw effort. Only the elevation of the top of the fuel in relation to the elevation of the pump. Physics."

Close, but not quite. If the tube between the two rises higher than the surface of the fuel, the pump has to lift that distance to prime. If it rises really high, you have an opportunity for vapor lock.
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Old 15-01-2021, 16:39   #11
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Re: New fuel tank - Connections on top vs side?

In the case of a fuel line that rises two feet above the fuel level, top or bottom makes no difference. In the case of in the case of the fuel pump below the level of the fuel once the line is full it makes no difference.
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