How do you prime fuel lines?
Priming the Fuel Pump
- Disconnect the hose that connects the fuel pump to the carburetor.
- Spray a three second burst of starting fluid into the carburetor.
- Repeat the spray-and-die procedure until you see fuel begin to wet the rag on the fuel line.
- Reconnect the fuel line to the carburetor.
How do you remove air from fuel lines?
To purge air from the low-pressure side of the fuel system, open fuel-line unions and bleed ports downstream of the pump, one at a time, beginning with those closest to the pump, and continue pumping until fuel, and not air, runs out.
What causes air in the fuel lines?
Fuel lines containing air can cause the engine to not run properly. Generally, air is introduced to the fuel lines when there is a leak or during fuel draining for equipment storage.
How do you run a fuel tank vent?
A typical vent line will run sideways across the top of the tank until it reaches the hull side and then angle upward to the vent fitting. The hose should run as straight as possible at this point in a manner that allows any fuel to drain back into the tank via gravity.
Where can I run my fuel tank vent?
If you are running a vent line it is important that the line is ran higher than the highest point on the tank including the fuel filler neck. Also, the vent line cannot have a dip in it where fuel or condensation can get trapped in the line.
Should outboard gas tank vent open or closed?
All outboard motors have vented gas tanks. Open the vent after you connect the fuel hose and tank to your motor. If you do not open the vent, your motor will experience a vacuum lock. Remove the filler cap from the fuel tank if your motor begins to “gasp” while you are making way in your boat.
Should I leave the vent open on my gas can?
The vent on your gas tank is necessary to prevent a vacuum block which would prevent fuel from being pumped from the tank to your motor. It needs to be open when operating your motor.
Does an outboard fuel tank need to be vented?
To meet the new regulations, fuel tanks can no longer be built as an “open” fuel system. Now that portable fuel tanks must be fully sealed, gas vapor is unable to vent and has nowhere to escape except to your engine through the fuel line.