Need help rigging a dual tank fuel system!!!
+ Reply to Thread
Page 1 of 8 1 2 3 4 ... LastLast
Results 1 to 14 of 112

Thread:
Need help rigging a dual tank fuel system!!!

  1. #1
    jetboataholic HawaiianJet's Avatar
    Join Date
    Mar 2008
    Location
    Lexington, KY
    Posts
    2,798

    Exclamation Need help rigging a dual tank fuel system!!!

    I am getting ready to do my fuel system and have no idea how to do it. This is a thread on the entire fuel system rigging; plumbing, wiring, filters, pumps, all the stuff that goes into rigging a proper fuel system for dual tanks in a jet boat.

    I just ordered this fuel filter last night so I don't need to know what kind of fuel filter to run. Just where is the best place to put it? And should I run two lines into it and only one out, or should I have a T-fitting before the filter and have the one line in and one line out?


    Also need to know how to hook the two sending units to the one gauge and be able to switch between them. Are sending units compatible with all gauges or do I need to get new sending units to match my gauges?

    I have a mechanical fuel pump right now, but I will be converting to an electric fuel pump, probably next year. Or maybe this year while I'm doing this rigging, all depends on whether or not my partner on this project decides to get off his ass and start contributing some money and time to the project.

    The plumbing will be done with just the black 3/8" fuel hose and the brass barbed fittings, to save money for other more important things. Changing over to AN lines will be no problem in the future after I get it plumbed up in the black hose and if it actually works right. Don't want to spend the money on the AN lines and find out that I have it all rigged up wrong and have to change some things, that would be a very pricey mistake.

    I need to know anything that you can think of that goes into a dual tank fuel system. I know absolutely nothing about how to do this, so that one tank doesn't drain faster than the other, or however it is supposed to work.

    Please post lots of pictures. I'm a visual person, and have trouble visualizing words.

    Thank you.
    Last edited by HawaiianJet; 05-11-2008 at 08:48 PM.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Banned
    Join Date
    Jan 2008
    Location
    El Cajon, CA.
    Posts
    3,605

    Default

    All I have for you are words.

    The way most of the jet boats came stock was equal length fuel lines coming out of the tanks going into a T, from the bottom of the T it went to a fuel filter and from the filter it went to the fuel pump. It's the simplest way to do it. Most of them only had senders in one tank, because as long as everything else was working coreectly both of the tanks drained equally. More often than not, from my experience, there's something wrong with the 30+ year old fuel tanks and their components. The best way to do it, IMO, is to take everything (senders, vent tubes, pick up tubes,etc..) out/apart, clean it all, and put it back together. From my experience it's pretty common to have hidden problems with at least one of the tanks.

    I would run one line into the filter and one line out of the filter.

    Usually there are two different types of fuel gauge senders, Ford and GM. All the boats I've worked on had GM senders in the tanks.

    You can put valves on the tanks so you can drain/use them individually but you'd be messing with the balance of the boat a little bit by draining/using the tanks individually.

    Two sending units/two fuel tanks and one gauge. You would need a toggle switch that I can't remember the correct name of the switch right now (brain fart), but it's basically on/off/on. There are more complicated ways of doing the same job.

    IMO

  4. #3
    jetboataholic HawaiianJet's Avatar
    Join Date
    Mar 2008
    Location
    Lexington, KY
    Posts
    2,798

    Exclamation

    Thanks!

    I'm sure that their Chevy sending units because that's all this boat has ever had in it.

    Yeah, I was thinking about taking the tank components out. It's just that I have to remove the tanks in order to do this, and I already glassed in my tanks. But, I guess that would teach me to remove and inspect everything before attaching it to the boat. I really need to come up with a way to attach my tanks, but have them easily removable, and not having to lay fiberglass across the bottom edge to keep them from bouncing around. How does everybody else attach their tanks to the hull? I have the square tanks, not the round tanks. There are mounting tabs on the back, but there is nothing to bolt them to, and I don't want to put any holes in the side of the boat.

    Here's a picture of the tanks, before the engine was in.


    Thanks.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    ... Some Kind Of Monster's Avatar
    Join Date
    Dec 2007
    Location
    East Side
    Posts
    2,056

    Default

    The way I would do it (and did do it) is to have each fuel tank routed to the filter/seperator you bought. I left the lengths unequal and put shutoff ball valves on each of the incoming lines. With the unequal length inputs, I have unequal draw so the tank with the sender drains a bit faster. This way I know I have a bit of reserve left when the gauge reads empty. I can also shut off the empty tank and draw from only one. This method works great for me and is pretty simple.

  7. #5
    Banned
    Join Date
    Jan 2008
    Location
    El Cajon, CA.
    Posts
    3,605

    Default

    There is another advantage to having valves on each tank, if one of the tanks fail for whatever reason you can use the valves to get back to the dock.

  8. #6
    Senior Member HBjet's Avatar
    Join Date
    Dec 2007
    Posts
    678

    Default

    Quote Originally Posted by hotrod56cars View Post
    There is another advantage to having valves on each tank, if one of the tanks fail for whatever reason you can use the valves to get back to the dock.
    How does a gas tank fail?

  9. #7
    Senior Member Boat 405's Avatar
    Join Date
    Dec 2007
    Location
    San Diego, CA
    Posts
    3,732

    Default

    here is a pic. Do this.

  10. #8
    jetboataholic HawaiianJet's Avatar
    Join Date
    Mar 2008
    Location
    Lexington, KY
    Posts
    2,798

    Talking

    Why are they upside down?
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  11. #9
    Senior Member dragstr19's Avatar
    Join Date
    Feb 2008
    Location
    Chandler AZ
    Posts
    409

    Default

    Quote Originally Posted by Some Kind Of Monster View Post
    The way I would do it (and did do it) is to have each fuel tank routed to the filter/seperator you bought. I left the lengths unequal and put shutoff ball valves on each of the incoming lines. With the unequal length inputs, I have unequal draw so the tank with the sender drains a bit faster. This way I know I have a bit of reserve left when the gauge reads empty. I can also shut off the empty tank and draw from only one. This method works great for me and is pretty simple.
    way too go skom

  12. #10
    Senior Member dragstr19's Avatar
    Join Date
    Feb 2008
    Location
    Chandler AZ
    Posts
    409

    Default

    Quote Originally Posted by HawaiianJet View Post
    Why are they upside down?
    whats the problem if you cant read it you wont remember how to use them. sweeeeet

  13. #11
    Senior Member Boat 405's Avatar
    Join Date
    Dec 2007
    Location
    San Diego, CA
    Posts
    3,732

    Default

    Quote Originally Posted by HawaiianJet View Post
    Why are they upside down?
    I had them mounted on the inside of the gunnel on the back of a 19 daytona, I did it that way so the handles won't be impossible to get up underneath the gunnel. If you were to mount it on the transom I would turn them differently

  14. #12
    Senior Member Boat 405's Avatar
    Join Date
    Dec 2007
    Location
    San Diego, CA
    Posts
    3,732

    Default

    Or you could do it like this with a selector valve before the filter.

  15. #13
    jetboataholic HawaiianJet's Avatar
    Join Date
    Mar 2008
    Location
    Lexington, KY
    Posts
    2,798

    Default

    Quote Originally Posted by widowmaker View Post
    Or you could do it like this with a selector valve before the filter.
    Wow, that's a big jet boat! Lots of room to put stuff in that boat.

    Where do I get one of those? And how much?

    Thank you.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  16. #14
    Senior Member Brendellajet's Avatar
    Join Date
    Dec 2007
    Location
    Ladera Ranch
    Posts
    2,135

    Default

    why not just run two lines into the filter & one out? Im running the same filter that way in my boat and both tanks are draining fine

+ Reply to Thread
Page 1 of 8 1 2 3 4 ... LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95