First, gauge connect with pressure line and return line. then turn on engine. you will see the rate of flow and pressure on gauge.
carefully
They may be marked "S" and "D" for suction (low side) and discharge (high side). A simpler way would be to look at the lines going into and out of the AC.... the smaller line will be the high pressure line, while the larger line will be the low pressure line. The low pressure line will connect at the compressor inlet, and the high pressure line will connect at the compressor outlet.
There is a test port on the fuel line in back of the engine. You will need the proper adapter and gauge to connect to it. When you do connect to it, you will cycle the ignition on and off until the fuel pressure peaks. If the system is healthy you should have a reading of 60 to 66 psi and hold it.
you have 2 hoses .a pressure line and a return line .the pressure line is steel while the return is rubber hose.
The 1940 chevrolet deluxe was powered by a 216 cubic inch In-line 6 cylinder. The engine was rated at 85hp @3400rpms.
There are 2 fuel lines. One is a pressure line to the injectors and the other is a return to the tank.
Your local parts dealer SHOULD have that. I purchased some high pressure fuel lines from NAPA just this week nope i even tried the Chevrolet dealerships
depends ON THE MAKE MODEL YEAR AND ENGINE
On the inlet fuel line of the carb.
Show diagram for Chevy 305 engine
It is on the low side line as it runs across the firewall under the hood, between the engine and the firewall, generally closer to the passenger side of the vehicle.