80s Fuel Flow Sensor. All you ever wanted to know!
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80s Fuel Flow Sensor. All you ever wanted to know!

Hi all,

I have been exchanging e-mails with Joe Dydasco of Floscan.  He seems to be a 
pretty nice guy!  He has answered all of my questions about the Fuel Flow 
Sensor without hesitation.

He explains that the sensor uses a photo LED and a wheel (very similar to 
your average computer mouse by the way.  Take one apart and look inside.)  

Years ago, I had heard that one of the possible reasons for the 80s Imps EFI 
problems was that people did not use 'approved' gasolines (no methanol) and 
also used Gasahol which may have deteriorated the plastic of the LEDs in the 
fuel metering system.

I am not sure, but I believe that newer EFI systems use magnetic sensors.  Oh 
well, if this is true, think what might have been.

Now I know that there IS some moving parts in that 'electrical' area of that 
sensor.  I may try to take the metal 'plug' out of mine.  The only problem is 
if I break it the car is dead until I get another.  Hmmmm.

The following is my entire e-mail exchange with Joe.  Enjoy!
-----Original Message-----
From: Daniel Wing
Sent: Thursday, May 30, 2002 12:26 PM
To: joe.dydasco@xxxxxxxxxxx
Subject: Fuel flow sensor for automotive use


I was wondering if this was the company that provided the
fuel flow sensor for the Chrysler Imperial carburetor retrofit
program in the 1980s?

I have a fuel flow meter on my car that has the name
FLOSCAN 264 on it.

There is some German writing on the housing and there are
three wires that come out of it with connectors on the end.

Let me know, thanx!

Daniel Wing


Yes, we're the same company.  Specify P/N 264-905-04 for the replacement
sensor.  Cost is $110 each and we accept all major credit cards for

Joe Dydasco   

-----Original Message-----
From: Daniel Wing 
Sent: Monday, June 03, 2002 10:41 AM
To: joe.dydasco@xxxxxxxxxxx
Subject: Schematic available?

Hi Joe,

Boy have you made a few people happy!  I belong to the Online Imperial

There are a few members that own 80s Chrysler Imperials with
the carburetor retrofit kit.  I know of a at least one member that will
be placing an order for a new fuel flow sensor right away!

I was wondering if there is a schematic available for the original (and
the replacement) Floscan 264 sensors?  I am creating a wiring diagram, for
the club, of the retrofit kits that were installed and would like to add
the schematic of the sensor to it if I could.

Let me know, and thanx!!

Daniel Wing


Hi Daniel,

Sorry for the late response.  I'm currently in Las Vegas attending a
trade show.  Not much to the wiring.  Red wire = 12V, black = ground,
white = signal.  Inlet and outlet ports are stamped right on the body.
Hope this will do.

Regards, Joe

-----Original Message-----
From: Daniel Wing
Sent: Wednesday, June 05, 2002 8:06 AM
To: joe.dydasco@xxxxxxxxxxx
Subject: thank you for the info


Thanx for the info.  I will include it in my wiring diagram that will
get posted to the club.  I have already posted the replacement part
number for the sensor.

Just in case you are interested, here is the web address for the Online
Imperial Club:


Stop in and browse around if you like.

(A side note.  I am curious, how does the sensor work?  Is there some
sort of turbine that sends out the signal?  Just being nosy, I like to
figure out how things work, being an engineer by trade.)  8-}

Thank you again!

Daniel Wing


Our 264 sensor utilizes opto-electronics to measure fuel flow.  As fuel
flow thru the sensor, it spins a rotor which interrupts an LED light
beam to a photo-transistor.  These signal "breaks" create a square wave
signal which the meter counts as pulses.  There's roughly 45,000 pulses
per gallon with the 264 sensor.  I'll check out your website when I
return to the office on Monday.

Regards, Joe 

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