Fuel System operation &/or schematic

ROD SPEARER

MEMBER
1986 TOYOTA PICKUP

I have a Toyota Hilux "Light truck" with the petrol 3Y engine of 2L capacity which is a "research" vehicle. My manual (Haynes) and visual inspection of the carburetted naturally aspirated engine reveal a fuel feed and return line system as well as a "vapour line", but I have no description how the fuel system operates. Everything works a it should. I'D LIKE TO INSTALL A FUEL FLOW METERING DEVICE somewhere in the line(s) working on the principle of a rotameter, or paddlewheel. The electronic microcomputer with it counts down from a volume of fuel entered into memory. WHERE DO YOU SUGGEST I INSERT THE METER? I am a pensioner. Many thanks. Rod

1 Reply

MATHIASO

MECHANIC
1,209 POSTS

Here is the fuel system on your vehicle.
I can see only vapor line . there is no return line.
When the vehicle is stopped or the engine is running at low speed, the vacuum switching valve is closed; fuel vapor travels only as far as the case where it is stored. At cruising speed the vacuum switching valve opens and the stored vapors are drawn into the intake manifold along with fresh air drawn through the air filter.
It does not show a return line.
here it shows the case storage system for evaporation control .