Fuel Tank Sender, Fuel Level Notes Correction +Photo

[Ward Hill Press]

Some notes on changing the sedan fuel tank sending unit:
If you have 2 gallons in the tank you can remove the sending unit without any leaking.
There is a set screw for the float rod, don't bend the rod.
I bought my sending unit from Z Car Depot, I am not sure that's the reason I had to recalibrate it for the 510. As delivered it made the gauge read optimistic.
I couldn't drain the tank with the drain plug, the car is in a residential building, I didn't want the tenants complaining. The only other spot I had was outside up against that same building.
I used a Harbor Freight Multi-Use Transfer Pump (siphon). The discharge container must be lower than the intake hose.
Photo shows the spot that will put the gauge just below the low white line with 2 gallons of fuel.
Steve


At 11:17 AM 9/15/2025, you wrote:

Not sure where near empty is. While I have been working on it I have put in a gallon or 2 at a time. I do remember on my way to Summit Point 2 years ago I put more gas in than I have ever been able to put in a 510, 11+ gallons IIRC.

When I siphoned the tank to replace it.....years ago, I still had gas in the tank, but probably under the sending unit hole. I suspect the syphon hose curved at the bottom of the tank. I have only a 1 and 2 gallon gas can. Trying to avoid buying another for just one use. I guess I'll get as much out as I can and then drive it until I run out of gas.

IIRC the first line on the fuel gauge is about 2 gallons remaining, at least that's where I will try to set it.

I have had some luck with opening the trunk early in the morning and simply looking at the condensation line on the outside of the tank. When the conditions are right, the tank sweats at the internal fuel level.

Nathan

It's parked indoors right now, but I can try to put it outside when it is warm and use a laser thermometer to find the line.
Steve

At 08:10 PM 9/14/2025, you wrote:

Hoist rear-end or park on steep hill when near empty?

-----Original Message-----
From: Ward <ward...@rcn.com>
To: bluebird510 <blueb...@googlegroups.com>
Date: Friday, 12 September 2025 11:19 PM EDT
Subject: [Bluebird510] Fuel Tank Sender, Fuel Level


I replaced the fuel tank sender with one from a 240Z supplier a
couple of years ago. It's optimistic, but I don't remember by how
much. Anyone have a clever way I tell if the fuel level is below the
sender opening? I want to reset the sender.
Steve

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