How many check valves does a mechanical fuel pump have?
A mechanical fuel pump has a two-port check valve, one that is located on the pump’s inlet and one that is located on the pump’s outlet. The check valve is designed to make the fuel in the vehicle only flow in the correct direction from the fuel pump and to maintain pressure.
What kind of hoses are used for fuel dispensing?
Below you’ll find fuel dispensing hoses for use in petroleum, agricultural, & industrial applications, including: E25 & E85 assembly hoses, gas dispensing hoses, curb pump hoses, & farm fueling transfer hoses.
Where is the engraved line on a fuel pump?
Within this window an engraved line can be seen on the spring holder of the fuel pump. When the cam follower is displaced by the cam, it pushes the spring holder up. When the engraved line coincides with the line on the fuel pump body, then the fuel pump plunger is at the position where it is just covering the spill ports.
Where is the test point for a fuel pump?
Hook the pressure gauge to the fuel pump test fitting. Locate your fuel pump test point, which is usually near the fuel injectors, and locate the point at which the pump hooks up with the filter injector rail. There should be a separation joint or a test port, where the pressure gauge attaches.
What happens when the check valve on a fuel pump fails?
If the check valve fails or is jammed open by fuel contamination, the hold pressure will leak down. If that happens while the engine is cold, the starter will crank a bit longer while the fuel pump builds enough pressure to start the engine.
How does a single line fuel delivery system work?
On a single-line fuel delivery system fuel pressure is controlled by an internal, non-modulated fuel pressure regulator in the fuel pump module. The two-line fuel delivery system returns excess fuel to the tank using a return line, while a single-line fuel delivery system uses the same line.
What’s the best way to check your fuel pump?
Use a short piece of rubber hose on the filter inlet. Blow through the filter inlet, paying attention to the resistance, which should be minimal. Inspect the screen for debris and replace the filter if necessary by blowing through the outlet side of filter into a white rag or towel. Get a fuel pressure gauge.
How does the direct gasoline injection system work?
Direct gasoline injection uses a conventional single-line, low-pressure fuel pump and integral pressure regulation system to supply fuel to a high-pressure mechanical fuel pump mounted on the engine, and uses separate sensors to monitor the low and high pressure portions.
If the check valve fails or is jammed open by fuel contamination, the hold pressure will leak down. If that happens while the engine is cold, the starter will crank a bit longer while the fuel pump builds enough pressure to start the engine.