Fuel Tank Sender

HydroCanis · July 2015

Hope that it in fact works. I'd install a FloScan tomorrow if they didn't cost so much.

Suzook · July 2015

Thanks for the positives and I hear you on the FloScan, but then again what's a boat other than a hole in the water to throw money into. Sorry, been waiting for the opportunity throw that out there. So, received my speedo and just waiting for the t'storms to clear so I can install it. Hope you have a great 4th of July.

Suzook · August 2015

So, finally getting around to a follow-up and, yes the fuel gauge is installed and working in that it bounces around between 3/4 and a 1/2 tank. However, I've done a lot of boating to get to this point and still have no idea what the actual reading is. Will probably run out of fuel the next trip out, ha! As the weather cools will start thinking about attempting to R&R the sender, or have another beer and put it off till spring.

HydroCanis · August 2015

Looking forward to hearing how it works out while I have another beer.

HHP123 · August 2015

I have a 1998 240 fundeck w/ a 66 gallon tank in which I replaced the sender. There is an 6" access hole in the floor, (sole?), above it, but not quite in line. What I am saying is that the unit is not directly under the access with little room to get at it.

My boat has a poly tank with the mounting ring for the sending unit molded into it. I used a universal gauge which has an adjustable arm for tank depth. The mounting flange on mine has asymmetrical screw holes in it which means you need to note the direction of the arm when you remove the old one. I did not, and went ahead and installed the new one and it read it empty with the tank filled to the max. The float was pressing up against the side of the tank, which you can't see or feel during installation.

After I sorted that out it worked fine but was pretty frustrating. BTW, the earlier post re: resistance are correct and helpful. You can connect the wire to the new sending unit to a VOM or gauge, and move it through its travel and see the change values. It was a knuckle buster for me, but worth it.

If fate has provided easy access to your unit you can use a mechanical reading float gauge.

M99 · August 2015

One additional test that can be done easily to figure out if you have a bad sender, gauge or wire in between, is to buy a resister wheel at any electronic store, pretty cheaply. Unplug the wire to the sender and attach the alligator clips from the resister wheel to them. As you change resistance from around 30 ohms to 240 ohms, the gauge should respond in an approximately linear fashion. If it does, then you proved the gauge and wires are fine and the sender is not producing the correct resistance.

rdcastle · September 2015

Guys, Guys, Guys! When the fuel gauge is reading a little lo, just speed up some. Works every time:)

Suzook · February 2016

A little late on the follow up but here goes. So, being that my sender is just beyond my finger tip range (see above pic) I decided to go low tech. Towed the boat to the bottom of a hill, popped the access cover & put a level on the tank itself to verify level after it stabilized. Applied system power & registered a little lower than 3/4 full, towed to the gas station and put in 15 gallons. Repeated above operation with gauge now pinned full. Yeah not the most technically proficient testing method but I'll run with it and consider myself very lucky. Hope everyone has been well since my last post and wish ya'll the best for the up coming season.

Fuel Tank Sender

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