How does Pres-sure work on a fuel pump?
Pres- sure in one direction pushes the valve on to its seating, closing it; pressure the other way lifts the disc and opens the valve. Valves last many years, but dirt can get in and stop them seating properly. For cleaning, see Overhauling a mechanical fuel pump .
How do you check a mechanical fuel pump?
Checking a mechanical fuel pump. A mechanical fuel pump Check the fuel-pipeclips for tightness. Inlet valve Outlet valve The pump diaphragm,omitted here for clarity, fitsunder the brass centre cupand its outer edge is heldbetween the two halves ofthe body. Use the operatinglever to checkwhether the pumpis working.
What does it mean when your fuel pump is not working?
If fuel spurts out, there is a carburettor fault (See Checking and cleaning an SU carburettor ). If no fuel, or only a dribble, emerges, either there is a blockage or leak somewhere in the fuel line (See Checking fuel pipes ) or the fuel pump is not working.
What should I do if my fuel pump gushes?
Unscrew or cut off clips, depending on the type. Have a couple of tapered plugs or old pencils handy to block the fuel lines in case they gush petrol when you disconnect them. Sometimes the lines are held on with wire clips which have to be cut off with side cutters. Replace them with new screw clips.
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.
Why does the fuel pump relay need to be Tip Top?
The fuel pump relay needs to function in tip-top condition if the engine is expected to run without any issues. Therefore, any compromise in the fuel pump relay can directly cause engine problems, such as the stalling of the engine.
Who is the best mechanic to fix a fuel pump?
Mark Gittelman is an ASE-certified master technician with over three decades of experience in the auto repair field. The standard mechanical fuel pump found in classic cars is very reliable.
Can a vacuum test a mechanical fuel pump?
Many inexpensive old-school vacuum testers can read mechanical fuel pump pressure just as well as vacuum pressure. To perform this test, you should connect the test gauge to the metal output line using a spare piece of rubber fuel hose and a clamp. Once the connection is sealed, crank the engine over for 20 seconds.