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Nissan Sentra Fuel Pump Assembly

Common Culprits behind Nissan Sentra Fuel Pump Assembly Problems

Fuel pumps have three types: the rotor cells; the gerotors, which are similar to some oil pumps as they squeeze liquid through the use of a star-shaped rotor; and the turbine type, the latest trend in original equipment (OE) manufacturing. Pump inadequacies can cause drivability problems such as momentary cutting out, hesitation, low power, and stalling at inopportune moments. Here are the things you should look into when diagnosing your Nissan Sentra fuel pump assembly's problems and their causes.

Spark, compression, and fuel

Spark, compression, and fuel are the legs of the tripod that support an engine's ability to run; so for a car's engine to give a good performance, you have to make sure that aside from the fuel, the spark and compression should also be working at an optimum level. Do a spark check and make sure the camshaft is still connected to the crankshaft, and if these two elements are okay, you might want to start checking the gasoline for problems.

If you don't hear the pump running for a few seconds after turning the key on, you might want to check the fuse to know whether it's blown or not. Fix it if it is; repair is also necessary if pump electrical draw, or the amps it's being forced to carry, is too high.

Amperage testing can be done by hooking up the meter in series with the load, or with an inductive pickup you clamp around the wire. You need to connect one of the ammeter's leads to the positive battery post and the other to the pump's hot wire.

If you see anything over 5 amps with a low- to mid-pressure system (13 to 45 pounds per square inch), or 7 amps with a high-pressure version (60 psi), you've got a problem. Too low psi is also not good. Causes of too few psi to start your Nissan Sentra can be clogged fuel filter, a blocked pick-up sock in the tank, a crimped line, and of course, a weak pump.

Gauge readings

Violent or fast needle swings between dead-head and running pressures in your Nissan Sentra's gauge means everything is okay. A slow rise means trouble for the engine's workability; pulling the pressure regulator's vacuum hose should help you see an increase in the swinging.

Nissan Sentra Fuel Pump Assembly Bestsellers View more

  • How to Take Proper Care of Your Nissan Sentra Fuel Pump Assembly 04 March 2014

    The fuel pump assembly is used to supply fuel to the fuel injection system or carburetor of your Nissan Sentra. Oftentimes, you take it for granted, figuring if it works, it's alright to just leave it alone. Proper care can go a long way to keeping your fuel pump assembly running strong and reliable. Here are some maintenance tips for your fuel pump assembly.

    • Regularly inspect your fuel pump assembly.
    • Regularly inspect the fuel pump for signs of leakage damage, cracks, dents, scratches, and signs of corrosion. Also check the fuel hoses, gaskets, and diagrams for punctures and cuts. Inspect the fuel tank to ensure there is no dirt, rust, or other contaminants, as they are some of the most prevalent causes of a fuel system failure. It is recommended that pumps be inspected at the 150-hour inspection and rebuilt or replaced at the 300-hour overhaul at least every two years.
    • When mounting the fuel pump, use the shortest practical line.
    • When mounting a fuel pump, vibration isolation is a primary concern. A line longer than 19 inches will likely dampen the pulse to a point where pump efficiency can be greatly reduced, so the pulse line must be rigid enough not to allow the pulse to be dampened by a tube wall. The pump should be mounted higher than the engine pulse port. If this is not possible, you should run the pulse line uphill a short length to form a 'trap' for fuel that might transfer from the crankcase.
    • Always give the proper amount of fuel needed for the pump assembly to run efficiently.
    • Your car's pump assembly relies on fuel running through it to cool and lubricate it, so if you starve your fuel pump assembly by not giving it enough fuel, it will overheat and fail.
    • When selecting the fuel pump assembly for your car's engine, be sure to have the year, make, model, and engine size of your car.
    • Having this information at your fingertips will guarantee that you get the right fuel pump assembly specifically calibrated to match your engine's performance specifications.