The fuel pump relay is an electronic component that is found on virtually all vehicles equipped with an internal combustion engine. It is often found in
the fuse box located in the engine bay
and functions as the primary electronic switch that controls power to the fuel pump.
What is EFI main relay?
Dual Contact (Single Relay), Ignition Switch Controlled This EFI Main Relay configuration is used on the Conventional eFi system. It uses separate power contacts to supply current to the fuel injector/ignition circuits and the ECU/circuit opening relay circuit.
Is EFI relay Same as fuel pump relay?
Up through 77 the EFI relay was actually
two relays combined in the same container
and one of them controlled the fuel pump (and was referred to as the fuel pump relay in some of the documentation).
Where is the relay for the fuel injection?
Location. Most fuel-pump relay units are located
under the dashboard near the steering column
. In some cases, the unit is located in the area where the steering column is mounted or near the engine’s firewall.
How do I know if my fuel relay is bad?
- Check Engine Light (CEL) Illuminated. …
- High Mileage. …
- Long Starting Time. …
- Engine Performance Issues – Stalling, Idling, Acceleration, Not Starting. …
- Car dies while driving. …
- Silent Fuel Pump Noise. …
- Park the car in safe and level ground.
What is the EFI fuse for?
EFI fuse powers your
circuit opening relay,fuelpump and sender
,O2 sensors, IAC valve,MAF meter, VSV for EGR, VSV for EVAP, VSV for pressure sensor, ECM, and Point side of the EFI relay.
What happens when main relay goes bad?
If the main relay is not supplying the engine computer with the power it needs, then the engine will not be able to crank and run the right way. Failing to get the main relay replaced will usually lead to the
car being unusable
.
Does a fuel pump need a relay?
It depends on how long the wire run is, how thick the wire is, how much current the pump draws, and what other types of controls you want on the pump circuit. Low current pump, short heavy wire, no funky control requirements means you can go without a
relay
.
Look for the fuel pump switch or inertia switch. This is a small box with a plastic button on top and an electrical connector at the bottom. On some vehicle models, this will be located in
the luggage compartment
. Look on a side panel for a small, round button which you can pry off with a small screwdriver.
What causes a fuel pump relay to go bad?
Dust, electrical power surge, and other factors
can cause a fuel pump relay to go bad. Dust and sudden voltage increases can affect a fuel pump relay’s performance and cause an engine to malfunction.
Is it safe to bypass fuel pump relay?
Registered. Jumpering or bypassing the fuel pump relay puts a constant
+12VDC
to the fuel pump. Basically you have voltage directly from the battery to the fuel pump, even with the engine turned off. You could use a jumper assembly with a toggle switch to manually turn on and turn off the fuel pump.
What are the symptoms of a bad fuel filter?
There are a few signs of a clogged fuel filter, here are few of the most common.
Having difficulty starting the vehicle, vehicle not starting at all
, frequent engine stalling, and erratic engine performance are all signs that your fuel filter is dirty. Thankfully for you they are easily replaced and not very costly.
What causes a car relay to go bad?
When operated at full load, a relay is said to have
failed when its contacts fail to operate (often because they weld together)
or when contact material erosion results in an unacceptable high path resistance. When asked to hot switch a load, a relay may only be good for 100,000 operations.
What does EFI stand for?
The EFI (
Extensible Firmware Interface
) system partition or ESP is a partition on a data storage device (usually a hard disk drive or solid-state drive) that is used by computers adhering to the Unified Extensible Firmware Interface (UEFI).
