Electric fuel pressure gauge
in General Tech Discussion
9 years ago
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Re: Electric fuel pressure gauge
by Bill Hertzel » 6 years ago
Bill
Yup, you were correct I had the red and black wires reversed. Unfortunately, it made no difference, the sender is locked down on sending 5VDC and still pegs the gauge at max psi despite the fact there is no pressure at the manifold.
Well, that's a bummer!
I would have hoped that the sender had reverse power protection.
I may be that you smoked the sender by hooking it up with the power leads reversed.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
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Re: Electric fuel pressure gauge
by Jim Isaacs » 6 years ago
Sometimes it does not matter with DC but that’s possible. I would think a 99 cent diode would be part of the design of the sender. I’ve returned it and I have another one on order.
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Re: Electric fuel pressure gauge
by Jim Isaacs » 6 years ago
New sender arrived and installed. Regarding the OEM harness, red is power, I used a piggyback spade connector from gauge to sender. Black is ground, I used a piggyback connector there as well. Green is for the sender input to the gauge. The fourth yellow wire was only sheathed yellow for an inch or so at the end of the harness, when investigated further up the harness it is a bare wire and apparently a shield wire although not in the traditional over-braid. There is a foil wrap over the sheathed wires plus this bare wire. I terminated it to a metal post on the back of the panel near the gauge. It all works as it should now.
Thank you said by: Bill Hertzel
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Re: Electric fuel pressure gauge
by Tim Treat » 6 years ago
many times the fourth wire is used to measure the resistance of the wire and subtracting that from the signal to improve accuracy of the reading
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