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post #11 of 28 Old 09-19-2017
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Re: Fuel gauge on PS34

I think the Raymarine folks would make a device for this and it would be great to have the information on your MFD. I have an analog gauge and mine is less than accurate. Seems to be on full for a long time then rapidly moves after about half the tank is gone. Not sure what power plant you have but I imagine you burn around 3/4 gal per hour at hull speed. I have an hour gauge that I log in my deck log when I top off (that seems to be the only time I know how much is in the tank) and then I monitor the hour gauge. This is more accurate than the fuel gauge. When taking long trips I have 15 gallons strapped to the rail. You definitely know to run to the fuel docks when you have to pour diesel into a boat underway.

Good to hear you made it back. Hope this helps..

p.s. Rookie mistakes make for a knowledgeable skipper, never apologize for mistakes just don't repeat.

Indecision may or may not be my problem.

Last edited by Hush34; 09-19-2017 at 05:14 PM. Reason: missing info
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post #12 of 28 Old 09-21-2017 Thread Starter
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Re: Fuel gauge on PS34

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Originally Posted by Hush34 View Post
I think the Raymarine folks would make a device for this and it would be great to have the information on your MFD. I have an analog gauge and mine is less than accurate. Seems to be on full for a long time then rapidly moves after about half the tank is gone. Not sure what power plant you have but I imagine you burn around 3/4 gal per hour at hull speed. I have an hour gauge that I log in my deck log when I top off (that seems to be the only time I know how much is in the tank) and then I monitor the hour gauge. This is more accurate than the fuel gauge. When taking long trips I have 15 gallons strapped to the rail. You definitely know to run to the fuel docks when you have to pour diesel into a boat underway.

Good to hear you made it back. Hope this helps..

p.s. Rookie mistakes make for a knowledgeable skipper, never apologize for mistakes just don't repeat.
I have a Yanmar 3JH2E. I believe there is mention in the owner's manual that the fuel tank gauge tends to be inaccurate with less than 50% fuel remaining. I've never seen the tank out of the boat, but I'm guessing the bottom of the tank is angled, like an inverted trapezoid. If true, I can imagine that a float transducer would become inaccurate as the level decreases. Perhaps an ultrasonic one would be better?
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post #13 of 28 Old 09-21-2017
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Re: Fuel gauge on PS34

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I have a Yanmar 3JH2E. I believe there is mention in the owner's manual that the fuel tank gauge tends to be inaccurate with less than 50% fuel remaining. I've never seen the tank out of the boat, but I'm guessing the bottom of the tank is angled, like an inverted trapezoid. If true, I can imagine that a float transducer would become inaccurate as the level decreases. Perhaps an ultrasonic one would be better?
Yes, as I mentioned in an earlier post, that's exactly what happens with our setup too. Instead of installing a different gauge, you could put marks on the dial that indicate the true fuel level. An easy way to do that would be to keep an eye on the dial as you're refueling the boat.
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post #14 of 28 Old 09-21-2017
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Re: Fuel gauge on PS34

You learned a couple of lessons. One is how to bleed the fuel system. I suggest topping off the tank when it gets close to 1/2 to avoid EVER having to do that other than after you've changed the filters. Second is to carefully learn how your fuel meter display correlates to reality. Each time you fill up, note the fuel meter reading and how much it takes to fill the tank. You'll soon be able to glance at the meter and know what that means.

And PLEASE don't look for an app to load on your phone to substitute for common sense.
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post #15 of 28 Old 09-22-2017 Thread Starter
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Re: Fuel gauge on PS34

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Yes, as I mentioned in an earlier post, that's exactly what happens with our setup too. Instead of installing a different gauge, you could put marks on the dial that indicate the true fuel level. An easy way to do that would be to keep an eye on the dial as you're refueling the boat.
That is a GREAT idea!
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post #16 of 28 Old 12-05-2017
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Re: Fuel gauge on PS34

I hate to restart this old thread, but it is the first time I have been able to photograph my fuel tank gauge since the thread was current.

The fuel tank gauge in my PSC 34 is non-linear to compensate for the near triangular cross section of the fuel tank.


In the photo the tank is full. You can see the gauge markings for E, 1/4, 1/2, 3/4, and F. The magic marker dot beyond full is when fuel backs up into the fill hose. When I filled the tank from empty from 5 gal jugs after cleaning the tank (https://www.sailnet.com/forums/pacifi...fuel-tank.html), I found the gauge to be fairly accurate.

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post #17 of 28 Old 12-09-2017 Thread Starter
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Re: Fuel gauge on PS34

My fuel gauge appears to be slightly different, though I still need to experiment with it a little to get a better sense of how accurate it really is.

Anyone out there have a photo they can post of what the fuel tank looks like when taken out of the boat?
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post #18 of 28 Old 04-09-2018
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Re: Fuel gauge on PS34

I just happen to have the tank out of our (new to me) 1993 PS34. I rinsed it our several times with detergents then quickly with muriatic acid. It is very clean now.
Hope that this helps.
regards charlie
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post #19 of 28 Old 04-09-2018
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Re: Fuel gauge on PS34

Here are a couple of pictures of our fuel tank. It developed a leak a week or so after we got to the Bahamas. We did a little palm tree mechanic repair here rather than go back to Ft Lauderdale and have a new one made. The story is in my wife's blog, Irish Eyes to the Bahamas , the March 19, 2018 posting.





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post #20 of 28 Old 04-10-2018
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Re: Fuel gauge on PS34

I have a 1987 Pacific Seacraft 34, hull #67, and have measured the fuel remaining at each level on the fuel gauge. The tank is original and the sticker says manufacturer is Vic Berry Sheet Metal, 760 Newton Way, Costa Mesa, CA, tank capacity 30 gals.

I am not saying that my measurements apply to your tank, but if your tank is from the same manufacturer they might, so I give them below.

First, with the inspection port on the tank open I found that the tank was not completely full when the fuel gauge read F. It is not actually completely full until the gauge pointer just touches the upper-left corner of the black square on the right side, which is above the F mark.

The amount of fuel remaining in the tank at different levels of the fuel gauge I measured approximately as follows:

-gauge pointer just touches the upper-left corner of the black square on the right side, 30 gal
-gauge pointer at F, 23 gal
-gauge pointer at 3/4, 15 gal
-gauge pointer at 1/2, 9 gal

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