Re: [OMC-Boats] Fuel Sending unit

Thanks Lee.

I discovered I neglected to hook up the new fuel gauge when I installed it.  I'm sure there was a reason but it's been too long since I installed the new instruments.

After I removed the tank I hooked up the sending unit outside of the tank and found it to be working just fine....only problem now is the float has a pinhole leak cuz it had some gas in it.  It wasn't full, probaby about 1/3.  I was able to fully drain it but in the process it slipped out of my hand and though not hitting the ground hard, it created a new leak.  The only resolution is to solder it but I'm not thrilled at that prospect given it had gas inside.  I may decide to bag that potential bomb and replace the whole unit.

-Bill
Dallas, TX
1970 Evinrude Explorer - 155 Buick V6 - OMC Sterndrive
http://www.photobucket.com/evinrude_explorer

--- On Sun, 8/9/09, Lee Shuster (lib1) <lib1@...> wrote:

From: Lee Shuster (lib1) <lib1@...>
Subject: Re: [OMC-Boats] Fuel Sending unit
To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...mate.com>
Date: Sunday, August 9, 2009, 9:59 PM

The senders are stock Stewart-Warner 240-33 ohm "floating arm" units available just about anywhere with industry-standard 5-bolt mounting flanges. You can pick them up for around $25 - $40. BE sure and measure the tank depth and insure the arm has enough clear travel for the sender arm. Before you discard your original sender, check it with a ohm meter. 240 Ohms in the EMPTY position, around 30 to 40 ohms in the FULL position. Usually the wiring, ground or gauge fails long before the sending unit but not always. Also check the float for leakage (buoyancy).
There are better sending units employing reed or inductive technologies that require sizing to the near-exact height of the tank. Moeller offers them as well as others. I've never tried them but I have replaced the original sending unit with an AC branded unit I got at NAPA years ago.
Again any of these DO NOT need to be MARINE-RATED. Just be sure and properly ground the tank when you re-install it and install a new gasket and double check for leaks.
By checking the tank professionally cleaned and re-lined at any radiator shop, they will also pressure test it for leaks.
Just google 240-ohm Fuel sending units  you'll find toms of hits.
LEE

On Aug 9, 2009, at 4:36 PM, BLDFW wrote:
Since I have my tank out and cleaned up, and since it's not working, now is the time to change out fuel sending unit. I've looked in my parts book but it does not cover the gas tank or the sending unit.  I checked online for a universal sending unit but not seeing anything listed for my local parts store.

Anyone swap one out?  What did you do for a replacement?

Also, I cleaned out my tank and overall it's pretty clean.  I did detect some surface rust on the inside roof of the tank which I took a wire brush to and got as much as I could reach off.  I'm thinking between the pickup tube screen (which does not rest on the bottom, and the inline fuel filter any residual particles that might fall off will likely not be problematic.  Given that, I'm not seeing a need to have the tank relined.  It doesn't look that cruddy and it's not showing any signs of being compromised.  Thoughts?

-Bill
Dallas, TX
1970 Evinrude Explorer - 155 Buick V6 - OMC Sterndrive
http://www.photobucket.com/evinrude_explorer

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Received on Monday, 10 August 2009