All I know is that accurately measuring small flow volumes can be tricky. I remember a sensor that used a 'vortex street' of pins the fuel flowed through.
So I put a search term into DuckDuckGo and selected a block from the first page.
Quote:
NAVICO Electronic Fuel Flow Probe Sensor | West Marine
https://www.westmarine.com/buy/lowra...nsor--15957285
The Fuel Flow Sensor tracks engine fuel flow, fuel used, trip fuel used and seasonal fuel used - sharing the information with any compatible display unit connected to the NMEA 2000® network. With a speed source in the network, the fuel flow sensor can also calculate fuel economy.
In-Vehicle Flow Meters for Fuel Consumption Measurement
https://www.sentronics.com/applicati...n-measurement/
Precision 'low flow' volumetric fuel flow meter for testing of high-efficiency road car engines. Capable of measuring fuel flow rates of 0-4000 ml/min, FlowSonic LF delivers direct volumetric flow measurement with calculated mass flow measurement, with a 500:1 turndown ratio.
Buy FLOSCAN Marine Products at Discount Prices from CE ...
https://cemarine.com/collections/floscan
FloScan is the world's #1 producer of fuel flow sensor systems - over 500,000 used on cars, trucks, boats, and airplanes. (As a matter of fact, they invented them for each of these industries). Mercury Marine uses our fuel flow instruments to test engines.
Maretron - Fuel Flow Monitor (FFM100)
https://www.maretron.com/products/ffm100.php
Fuel Flow Sensor 8-70 LPM (2.11-18.5 GPM) MSRP $895. Part Number: M8AR Flow range : 480 to 4200 LPH (127 to 1110 GPH) Installation Instructions (pdf) Installation Instructions (html) Fuel Flow Sensor 10-100 LPM (2.64-26.4 GPM) MSRP $995. Part Number: M16AR
Top Quality Kytola Flow Meters - For Liquids, Oil and Gases
kytola.com
Operating since 1945. Proven expertise and quality....
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Stuff that jumped out at me bolded.