Fuel system question

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steves86ta

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« on: March 06, 2013, 09:39:43 PM »
Another question i have is how does the fuel switch work? I can try to explain, i can also take pictures later this evening.

My Bahner has twin aluminum tanks on the sides of the boat, they appear to be about 15 gallon tanks.
When i bought the boat the left side tank was full to the brim and the right side tank was empty, the previous owner told me that he has never filled up the left tank and the he only ever filled up the right tank.

So while i was doing the oil change i noticed there is what appears to be some sort of valve where the two tanks connect to the main feed line to the carb. It was pointing towards the Right Tank. I turned it to the left tank and then we took the boat out.

In fear that maybe the pickup was broken i filled the Right tank completely so that i had both tanks full to the brim. I did not mess with the Valve and we took the boat out. Now with the boat running i can hear electric fuel pumps which sound like they are on both sides (maybe a lift pump?) The part that im confused about is the engine also has a mechanical fuel pump which seems to pull from the two tanks and feeds the Carb.

Now what my main question is, do i have to switch this valve to where it is pointing to the tank i want to use? Is there a "middle" setting to where it will pull from both tanks? The reason i ask is because i never messed with the valve while it was on the water and both tanks seem to be at the same level of fuel as if they are feeding eachother? I can take a picture of the valve tonight if that helps.

Here are some pictures






Sorry for the newb question i hope someone is familiar with this setup im sure pictures may help.

Thanks
Steve
1980 Bahner 21' Mini Day
1968 Rogers project



crewchief22

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« Reply #1 on: March 06, 2013, 09:49:35 PM »
That type of valve doesn't have the ability to draw from both tanks at the same time.  It has a 90' port that will flow from one side inlet to the center outlet or when turned will flow from the other side inlet to the center outlet in the opposite direction through the port.

I don't see an electric pump in any of the photos.  You need to follow the hoses and see what you are working with.  The mechanical pump will pull from either tank through the valve without problems.

Hope some of this helps.
  • Boat #1: '77 Hondo Pantera GT Jet
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steves86ta

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« Reply #2 on: March 06, 2013, 09:52:05 PM »
That type of valve doesn't have the ability to draw from both tanks at the same time.  It has a 90' port that will flow from one side inlet to the center outlet or when turned will flow from the other side inlet to the center outlet in the opposite direction through the port.

I don't see an electric pump in any of the photos.  You need to follow the hoses and see what you are working with.  The mechanical pump will pull from either tank through the valve without problems.

Hope some of this helps.
Thanks for the info, i cant find an electric pump either, but i swear i can hear one with it running. But not with the key on. Could it be the drive making the noise? Is it possible that it may have an electric fuel pump inside of the tanks?
1980 Bahner 21' Mini Day
1968 Rogers project

mash on it

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« Reply #3 on: March 06, 2013, 09:54:28 PM »
Pretty standard dual tank valve set-up.
The pointer (not the hanlde/lever) should be pointing to the tank you are drawing from. there is no 'middle', I believe that would be off, cant remember.


Daniel
CJ/RR 212...under construction  "Pistol Annie"

ka0tyk

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« Reply #4 on: March 06, 2013, 09:56:21 PM »
looks like a typical seachoice 3 way brass fuel valve.  obviously the first 2 are left and right... but is the 3rd option both tanks or "OFF"?

http://www.iboats.com/Seachoice-Three-Way-Brass-Fuel-Line-Valve/dm/view_id.2941

if its both, it will always suck from the closest/easiest side.  i would avoid running one tank all the way to empty, it puts a lot of weight on one side of the boat, which in our tiny boats makes things interesting ride wise. 

also if it is both it might be worthwhile to grab a different valve or put ball valves on the tank pickups.  being able to shut off the gas is a good safety measure.

crewchief22

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« Reply #5 on: March 06, 2013, 10:01:58 PM »
Thanks for the info, i cant find an electric pump either, but i swear i can hear one with it running. But not with the key on. Could it be the drive making the noise? Is it possible that it may have an electric fuel pump inside of the tanks?

Unless you have more wiring going to the tanks than shown in the pics, you don't have an electric pump hiding inside your tanks  :o
  • Boat #1: '77 Hondo Pantera GT Jet
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The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

steves86ta

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« Reply #6 on: March 06, 2013, 10:02:30 PM »
looks like a typical seachoice 3 way brass fuel valve.  obviously the first 2 are left and right... but is the 3rd option both tanks or "OFF"?

http://www.iboats.com/Seachoice-Three-Way-Brass-Fuel-Line-Valve/dm/view_id.2941

if its both, it will always suck from the closest/easiest side.  i would avoid running one tank all the way to empty, it puts a lot of weight on one side of the boat, which in our tiny boats makes things interesting ride wise. 

also if it is both it might be worthwhile to grab a different valve or put ball valves on the tank pickups.  being able to shut off the gas is a good safety measure.
Thanks that looks like the valve, ill try the third option and see what happens. any ideas on what the noise im hearing could be? It sounds just liek a holley blue pump running (i have one on my streetcar) but it appears that its not connected to the fuel system. I verified the bilge and blower are off. And the motor for the trim pump is really quiet when it is running. Maybe its the drive? It makes the noise even if its in neutral though, hence the idea it might have been a fuel pump
1980 Bahner 21' Mini Day
1968 Rogers project

ka0tyk

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« Reply #7 on: March 06, 2013, 10:04:01 PM »
follow the hoses and see where they go...  if you're still confused post more pix.


hell post more pix anyways, we love pix here.  O0

steves86ta

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« Reply #8 on: March 06, 2013, 10:05:36 PM »
ill pull the boat out this weekend and try to grab a video with it running.
1980 Bahner 21' Mini Day
1968 Rogers project

SoCalPSD

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« Reply #9 on: March 06, 2013, 10:16:08 PM »
Take your belt off and see if it goes away

In my best "grandad" voice with a cigarette hanging out of my mouth....  "if a day goes by and you learn nothing, I hope like hell you got a lot of sleep".... :thumbup:

BIG JOHNSON

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« Reply #10 on: March 07, 2013, 02:59:14 AM »
looks like a typical seachoice 3 way brass fuel valve.  obviously the first 2 are left and right... but is the 3rd option both tanks or "OFF"?

http://www.iboats.com/Seachoice-Three-Way-Brass-Fuel-Line-Valve/dm/view_id.2941

if its both, it will always suck from the closest/easiest side.  i would avoid running one tank all the way to empty, it puts a lot of weight on one side of the boat, which in our tiny boats makes things interesting ride wise. 

also if it is both it might be worthwhile to grab a different valve or put ball valves on the tank pickups.  being able to shut off the gas is a good safety measure.
I had one of those valves for one trip or so. It wasn't clocked right, so it had to point downward for left tank and point to the right for the right tank... Did this  instead. The teflon leaked so I used motoseal afterwards.

I like being able to draw from both tanks at once. Keeps the boat riding evenly and I don't have to switch sides because I put gas in it whenever available and it never fluctuates more than an eighth of a tank if you start the weekend with both tanks full.

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« Last Edit: March 07, 2013, 03:02:32 AM by BIG JOHNSON »
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Horizonjet

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« Reply #11 on: March 07, 2013, 05:15:19 AM »
Neutral????
72 Horizon BBC

crewchief22

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« Reply #12 on: March 07, 2013, 07:07:47 AM »
Neutral????

It's an I/O.  You know, one of those odd tumor looking things with the wacker blade on it  :screwy:
  • Boat #1: '77 Hondo Pantera GT Jet
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The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

GT Jets

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« Reply #13 on: March 07, 2013, 07:33:01 AM »
It's an I/O.  You know, one of those odd tumor looking things with the wacker blade on it  :screwy:

Don't hate.... Just because he has an appendage bigger than yours...???

GT
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

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« Reply #14 on: March 07, 2013, 07:35:38 AM »
I had one of those valves for one trip or so. It wasn't clocked right, so it had to point downward for left tank and point to the right for the right tank... Did this  instead. The teflon leaked so I used motoseal afterwards.

I like being able to draw from both tanks at once. Keeps the boat riding evenly and I don't have to switch sides because I put gas in it whenever available and it never fluctuates more than an eighth of a tank if you start the weekend with both tanks full.

Sent from my ADR6400L using Tapatalk 2

I think ill be doing the same thing, where did you get your fittings? Just a regular hardware store?
1980 Bahner 21' Mini Day
1968 Rogers project

steves86ta

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« Reply #15 on: March 07, 2013, 07:37:04 AM »
It's an I/O.  You know, one of those odd tumor looking things with the wacker blade on it  :screwy:
Lol you guys crack me up, yeah its an I/O, I like it it seems to get the job done for me anyways. Just doesnt ride as nice as a jet
1980 Bahner 21' Mini Day
1968 Rogers project

mash on it

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« Reply #16 on: March 07, 2013, 08:59:23 AM »
It's an I/O.  You know, one of those odd tumor looking things with the wacker blade on it  :screwy:

One of them shiney spinney thingys? A skier processer?  :screwy:

Daniel
CJ/RR 212...under construction  "Pistol Annie"

ka0tyk

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« Reply #17 on: March 07, 2013, 11:16:24 AM »
I had one of those valves for one trip or so. It wasn't clocked right, so it had to point downward for left tank and point to the right for the right tank... Did this  instead. The teflon leaked so I used motoseal afterwards.

I like being able to draw from both tanks at once. Keeps the boat riding evenly and I don't have to switch sides because I put gas in it whenever available and it never fluctuates more than an eighth of a tank if you start the weekend with both tanks full.

Sent from my ADR6400L using Tapatalk 2

i put ball valves at the pickup on the tanks and then i tee together at my water seperator.

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« Reply #18 on: March 07, 2013, 01:23:10 PM »
I think ill be doing the same thing, where did you get your fittings? Just a regular hardware store?
Hose Man

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