Strange fuel sender

[Sefuller]

I have never seen a sending unit like this before - I have not removed it yet so no idea what the part in the tank looks like, but the only thing coming out the top is a long piece of very thin flexible tubing that goes up to the instrument panel (but was not connected to anything any longer). Anyone familiar with this arrangement?

 

[jssailem]

Not seen this before. There must be pieces not connected. From the info and image i can not see any mechanical means sending analog data to give fuel capacity. No pressure pump?

 

[LeslieTroyer]

In the 70 as John said the most accurate gauge was one that used air pressure to bubble air into the tank and measured how much pressure it took. They had a tank selector switch so could handle multiply tanks. The name escapes me.

Les

 

[Skipper]

This is a floatless design, measuring hydrostatic pressure instead.

 

[jssailem]

measuring hydrostatic pressure

You must be able to presuriaze the tank and compare the change in pressure over time. Must use a pump of some kind. And or a sealed system.

I would remove it if not working and get a Wema float system. Simple reliable and accurate. $50 or less depending on the depth of your tank for the sender.

 

[Mark Maulden]

In the 70 as John said the most accurate gauge was one that used air pressure to bubble air into the tank and measured how much pressure it took. They had a tank selector switch so could handle multiply tanks. The name escapes me.

Les

Think its called a tank tender. See if other tanks have the same..

 

[LeslieTroyer]

Think its called a tank tender. See if other tanks have the same..

Yup that’s the one I was thinking of.
Les

 

[Sefuller]

Thanks for the replies - interesting concept. Unfortunately, the gauge portion of the device does not seem to be with the boat any longer. As I have gone through the boat emptying lockers and storage compartments I have come across at least three other sending units Must have been a story there somewhere...

 

[Davidasailor26]

As I have gone through the boat emptying lockers and storage compartments I have come across at least three other sending units Must have been a story there somewhere...

Someone went through a lot of effort to avoid doing math. Engine Hours x Gallons per hour isn't so bad.