Matching fuel tank sender and gauge
I've just discovered that my Merc gateway will only trnsmit EITHER fuel flow, or fuel level, not both. Got it from this thread on THT. www.thehulltruth.com/marine-electronics-forum/949181-merc-150-four-stroke-circuit-diagram-fuel-level-sensor.html So that answers a question. The fuel manager on the Axiom Dashboard works on engine fuel flow vs whatever tank capacity you enter, should be accurate. But, of course, fuel managers like that don't know if you have been robbed, entered an incorrect amount when refilling, etc, so I'd like to hook up the existing tank sender to a gauge as a cross-check. I seem to recall not all senders and gauges match up, with different resistance senders available. I see 30-240 ohms is fairly common, and, as the tank is empty, I should be able to put an ohmmeter across it to check?
Grumpysmurf
Posts: 97
Date Joined: 26/02/09
Yeah check the resistance.
Yeah check the resistance. American boat vs European. Whitworths have a return policy of you get the wrong one
Haines Signature 610C with Mercury 150 EFI
ranmar850
Posts: 2702
Date Joined: 12/08/12
Finally got around to measuring.
Unfortunately, had to put a bit of fuel in. Would have been just over 1/3 full, showing 180 ohms. So I'm thinking it must be a 240-33 ohm sender. So I went and filled it, getting around 60 ohms, measured direct off the top of the sender and earth. So am I a) actually not full ( just going off fuel running out of the breather) or b) different resistance of sender? Unlikely as the other type commonly available is 0-160 ohms?