What causes a fuel pump to leak from the tank?
Another common place for a fuel leak is the hoses that lead from the tank to the fuel pump. Since the metal tube is exposed to the elements, it’s common to see these rusted and leaking. The rubber hose that connects the metal tube to the fuel pump can also dry rot and leak.
What to do when your fuel pump is not working?
Connect a fuel pressure gauge to the pump outlet, or tee a gauge into the fuel line at the carburetor. Crank the engine and note the pressure reading on the gauge. If there is no pressure, or if pressure is less than specifications, replace the pump. Most mechanical fuel pumps have a weep hole on the bottom side of the unit.
What causes a fuel return hose to leak?
If the fuel return hose becomes excessively worn or damaged, it may cause fuel leaks. A leaking fuel return hose may produce drips or puddles of fuel underneath the vehicle, as well as a noticeably strong fuel odor.
Why does my car lag after filling the tank?
If, after filling the tank the engine lags or jerks repeatedly, fuel foaming could be the cause. Fuel foaming happens when cold gas comes in contact with a hot carburetor fuel bowl. Gasolines that contain octane boosters or alcohol may alter volatility, which can cause drivability problems or hard starting.
Another common place for a fuel leak is the hoses that lead from the tank to the fuel pump. Since the metal tube is exposed to the elements, it’s common to see these rusted and leaking. The rubber hose that connects the metal tube to the fuel pump can also dry rot and leak.
How can I tell if my fuel pump is faulty?
Inspect the fuel pump visually. If fuel is dripping, the diaphragm is faulty and you need a new pump. Another way to check the pump is disconnect the fuel line at the carburetor and place it in a container. Crank the engine to see if the pump is pushing any fuel through the line.
If, after filling the tank the engine lags or jerks repeatedly, fuel foaming could be the cause. Fuel foaming happens when cold gas comes in contact with a hot carburetor fuel bowl. Gasolines that contain octane boosters or alcohol may alter volatility, which can cause drivability problems or hard starting.
Where is the weep hole on a mechanical fuel pump?
Most mechanical fuel pumps have a weep hole on the bottom side of the unit. When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction. This is one of the more common fuel pump problems. Usually found on classic cars between 30 and 60 years old.