Question about Cars & Trucks

1 Answer

Will the fuel pump run with the switch in the on position

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 21,873 Answers

For about 3 seconds. Then the engine computer needs to see oil pressure or RPM to power the pump relay.

Posted on Mar 29, 2015

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Where is the inertial fuel shutoff located on a 1999 Mercury villager van?


It is called the inertia switch or fuel pump cut-off switch

The fuel pump shut-off switch is

located in the driver's foot well,

behind the kick panel. The reset

button for the fuel pump shut-off

switch is accessible through an

opening in the kick panel.

Use the following procedure to reset the fuel pump shut-off switch.

1. Turn the ignition to the OFF position.

2. Check the fuel system for leaks.

3. If no fuel leak is apparent, reset the fuel pump shut-off switch by

pushing in on the reset button.

4. Turn the ignition to the RUN position. Pause for a few seconds and

return the key to the OFF position.
5. Make a further check for leaks in the fuel system.

Jun 26, 2017 | Mercury Cars & Trucks

1 Answer

I ran out of gas then i put gas in the car .now it want start .1996 camaro v6 3800 rs


You may have to "cycle" the ignition switch a few times to get fuel up to the fuel rails. Make sure the battery is fully charged. Turn the ignition switch to the RUN position (do not start yet). Listen to see if you can hear the fuel pump running. If you can hear it, turn the key of and wait about 15 seconds and turn the key to the RUN position again. Repeat this step one more time, the turn the ignition to START.

If you cannot hear the fuel pump running when you turn the key on, then you most likely lost your fuel pump when you ran out of gas. This is pretty common - especially if the fuel pump has a lot of miles on it. If this is the case, then you will have to replace your fuel pump.

Sep 03, 2011 | 1996 Chevrolet Camaro

1 Answer

1999 Mercury Grand Marquis. with KOEO, voltage to fuel pump is 6.58 volts. Battery voltage is 12.47 Vdc. Removed fuel pump and installed jumper wire and fuel pump receives battery voltage. Why is voltage...


With my pump failure, I read the exact same 6.5 v at the inertia switch in my trunk with the key in the "on" position and engine not running or cranking. When cranking, the voltage to the pump jumped to +12V and if the engine did run, the voltage should stay at +12V.

The Ford manual states +12v should be at the motor for some number of seconds in the key "on" position then drop off if the engine is not cranking or does not start. In my pump failure case, I never saw 12V at the inertia switch in just the key "on" position, only +6.5V as the +12v fuel relay under the hood never engaged and/or stayed latched on.

In my situation, I measured an open circuit at the pump motor winding and suspect the +6.5V I was reading came from the Powertrain Control Module. I am also guessing if my pump winding was not open, the +6v voltage would have been +12v for a number of seconds for fuel priming as the fuel pump relay is temporarily energized, then drop to zero (relay off) if the engine does not continue to crank or run.

With my pump motor winding open, the Power Control Module may not have been loaded properly to function (reading +6.5 floating volts instead) in the key "on" position and therefore never climbed to the full +12V. There obviously was no fuel pressure at my schrader valve on the fuel rail when cranking which indicated an open wiring circuit (splice, ground or connector) or open pump winding. The 12v I was reading when cranking at least indicated the fuel pump relay was working.

With my new pump installed, I listened for the pump running in just the key "on" position. I believe I barely heard it running after the repair as it was running very quietly which indicates the +12v was there which supports my theory.

Dec 13, 2010 | 1999 Mercury Grand Marquis

1 Answer

Fuel pump not working. Followed your directions to reset theft device. Replaced relay (not sure which one it was...i guessed). Replaced fuel pump. Mother-in-law said she heard a noise from under dash then...


The relay only operates after the engines oil pressure is at operating PSI. If the relay was replaced and the fuel pump is not heard working when the ignition key is switched to the ON position for 5 seconds, replace the engines oil pressure switch. That switches 3rd wire connects to the fuel pump to run it for 5 seconds to prime the engine. That switch can be tested without the engine running. Just turn the key to the on position and listen for the pump to run for 5 seconds

Jul 19, 2010 | 1996 Buick Skylark

1 Answer

What is the fuel symbol for in the pass. side floorboard of my 01 focus


FUEL PUMP SHUT-OFF SWITCH

After a collision, if the engine cranks but does not start, the fuel pump shutoff switch may have been activated. The shutoff switch is a device intended to stop the electric fuel pump when your vehicle has been involved in a substantial jolt.
1. Turn the ignition to the OFF position.
2. Check the fuel system for leaks.
3. If no fuel leak is apparent, remove the cover plug in the trim and reset the fuel pump shutoff switch by pushing in the button on the switch.
4. Turn the ignition to the ON/RUN position. Pause for a few seconds and return the key to the OFF position.
5. Make a further check for leaks in the fuel system.

The fuel pump shutoff switch is located in the passenger's foot well, behind the kick panel. The reset button is accessible through the recess in the kick panel.

Replace the cover plug in trim after reset procedure.

7395ccb.jpg

THis and other details can find in the Owners Manual.

Hope helps (remember rated and comment this).

Jul 22, 2010 | 2001 Ford Focus

1 Answer

1990 4Runner, 3.0L engine, fuel pump pressure test?


The pump should be running and producing fuel when ignition switch is in the on position.

Jun 03, 2010 | 1990 Toyota 4Runner

1 Answer

1988 chevy celebrity No fuel to the carberator.


without starting the engine position the key to the on position.
you can hear the fuel pump operationing for 4 to 6 seconds upon having the key on.
if not heard running check the fuel pump fuse, the fuel pump relay, and the engines oil pressure switch.
they all work the pump you see
the engine oil pressure switch runs the pump untill the engine reaches normal pressure
once the pressure is reached to the normal range the computer shuts that circuit off and turns the fuel pump relay on

May 22, 2010 | 1988 Chevrolet Celebrity

1 Answer

Will not start when hot. starter makes no different types of noise.


hello. perhaps I can assist you.

Perform this test:

Fuel pump test:

1. Get yourself a helper.

2. remove the gas cap.

3. have one person listen in the gas tank at the gas cap opening.

4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.

5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.

6. Does it ?.


If you do NOT hear it run, in most cases the fault is the fuel pump relay or the fuel pump..


As soon as you turn ON the ignition switch to start the engine a 2 second ONLY battery voltage signal is sent from the computer to the fuel pump relay and from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.

Once the engine starts, The computer BYPASSES the fuel pump relay and sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows thru the oil pressure switch back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.

Oct 01, 2009 | 2003 Cadillac CTS

1 Answer

No power to the fuel pump. looking for a wiring diagram.


The 15a efi fuse pwoers the computer fuel system components including the pump. If you NEVER have pump power, I would check the FP terminal in the underhood diag connector...this is the FUEL PUMP POWER wire tap. If it never gets off zero at any key position (Run or crank) your problem is either wiring, the circuit opening/Fuel pump relay, or the efi main relay, or the fuse itself. If it has power in 1 position but not the other, suspect wiring, or possibly the airflow meter. fuel pump switch power is run thru the airflow meter, if its not hooked up, the fuel pump relay cannot be closed in the run position, or if its open internally or the contacts are bad.

Sep 17, 2009 | 1991 Toyota Pickup

3 Answers

4.3 engine will not start, but will run if gas is poured into throttle body, and keeps running.


Check the fuel pressure at the fuel rail if 30 psi is not present it may be a bad fuel pump or fuel pressure regulator.

Jul 14, 2009 | 1999 Chevrolet Silverado 1500

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

15 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76649 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...