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No electric power to fuel pump - 1992 Toyota Pickup

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Check fuses and relays

Posted on Sep 26, 2009

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2005 Jeep Liberty not getting gas to fuel pump, all sensors good, fuel pump good. Is there a ASD on this vehicle?


Not getting gas TO the fuel pump ? Yes there is a ASD - auto shut down relay ,but has nothing to do with fuel pump power . Check the fuel pump relay . Videos on you tube testing fuel pump electrical circuit . Fuel Pump Electrical Circuits Description and Operation

Jul 24, 2016 | Jeep Cars & Trucks

1 Answer

My fuel pump is good, but foe some reason it's not getting any electrical power from the line....what should I do?


Well Jason you could have a bad fuel pump relay in the underhood electrical center . The PCM - powertrain control module turns on the relay . An your vehicle has a anti-theft system probably ! Is there A security light lit on the dash ? If not pull the fuel pump relay out of the electrical center an check for power an grounds , there will be two grounds an one battery voltage an one open . The open will be power when cranking the engine , this is the control side from the PCM . If you look on the side of the relay there should be a circuit diagram , an on the bottom the pin's should be marked 30 , 87 this is the fuel pump side of the relay. 87 is battery voltage , 87 goes to the fuel pump . Pin's 85 , 86 . 86 is ground an 85 is power from the PCM when cranking ! GM Fuel Pump Relay Testing

May 09, 2015 | 1997 Pontiac Grand Prix

1 Answer

What can cause power not to get the the fuel pump on a 2001 pon aztek


How do you know there isn't enough electrical power? Low pressure might indicate a bad or weakening fuel pump or bad fuel pressure regulator or possibly clogged fuel injectors. If the fuel pump is getting the 12V via relay/ignition switch then it's not an electrical problem, but a fuel delivery problem probably caused by the things mentioned above.

Apr 02, 2014 | 2001 Pontiac Aztek

1 Answer

Lost electrical power to fuel pump


There are many reasons why fuel pumps have no power, most (in tank) fuel pumps fail due to low fuel inside of tank.

These fuel pumps turn at an alarming rate which in turn causes an alarming amount of heat. This heat is then dissipated by the fuel inside of the tank itself.If the driver/operator allows to run the fuel very low and continue to do so, this will over time allow for the fuel pump to overheat due to the ONLY source used to cool the fuel pump is the fuel inside of the fuel tank itself. Electrically, view the operator's manual or similar source to locate fuel pump fuse and/or relay of which will open the electrical path when the fuel pump overheats.
This should be a pretty good starting point to locate/isolate electrical issue you may be experiencing.

Good Hunting to you & hope this gets you back on the road soon!
FASTESTNASCAR

Dec 27, 2011 | 1987 Mercedes-Benz Mercedes Benz 190 Class

1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

Jul 17, 2011 | 1995 Ford Explorer

2 Answers

My 93 cougar like sputters when running. no power, and idles real hard. what could this be?


I'm guessing fuel pump is going. Check for 40 PSI pressure with fuel pressure gauge. Check in engine comaprtment.
Section 10-01: Fuel Tank, Filters, Lines and Electric Fuel Pump 1995 Thunderbird, Cougar Workshop Manual
DESCRIPTION AND OPERATION Fuel Pump, Electric The electric fuel pump:
  • Is part of the fuel pump module.
  • Is located in an internal reservoir in the polyethylene fuel tank (9002) .
  • Is mounted with its inlet at the bottom of the reservoir.
  • Is designed to increase satisfactory pump operation during extreme vehicle maneuvers and steep climbs with low fuel levels.
  • The high-pressure fuel pump module on the 3.8L SFI and 4.6L-2V engines can supply 60 liters (15.9 gal) of fuel per hour at a working pressure of 269.0 kPa (39 psi).
  • The fuel pump module on the 3.8L SC SFI engine can supply 125 liters (29.0 gal) at the same rate and pressure.
  • The fuel pump module has an internal check valve to maintain pressure in the system after the engine is shut down.
  • The fuel pump module also has an internal release valve to provide protection from too much pressure if fuel flow becomes clogged in the fuel filter (9155) , the fuel line is damaged, or other factors.
  • Overpressure is limited to 850 kPa (123 psi) and reduced fuel flow will result if the pressure relief valve is activated.
  • The fuel pump module is protected at its inlet by a nylon fuel filter element (9365) which filters contaminants which could plug or damage fuel pump components.
  • The fuel filter element simultaneously allows passage of small quantities of water which may accumulate within the tank reservoir.
  • The electrical system has a fuel pump control relay in the powertrain control module (PCM) (12A650) which provides power to the fuel pump module through an inertia fuel shutoff switch (IFS switch) (9341) that is normally closed.
  • The electrical system provides power to the fuel pump module through two relays:
    • Fuel pump power relay.
    • PCM power relay.
The current path depends on operating conditions.
  • When the ignition switch (11572) is OFF, contacts of both relays are open.
  • When the ignition switch is first turned to RUN, the PCM power relay energizes and closes its contacts.
  • Power is sent to the fuel pump relay and a timing device in the powertrain control module .
  • The fuel pump module runs through the contacts of the fuel pump relay.
  • If ignition switch is not turned to START, the timing device in the powertrain control module will open ground Circuit 57 after about a second.
  • Opening the ground circuit deenergizes the fuel pump relay, which opens its contacts and de-energizes the fuel pump.
  • The circuitry provides pre-pressurization of the fuel system.
  • When the ignition switch is turned to START, the powertrain control module operates the fuel pump relay to provide fuel while cranking.
  • After the engine starts and the ignition switch is ON, power to the fuel pump module is again supplied through the fuel pump relay. The powertrain control module senses engine speed and shuts the fuel pump module OFF by opening the ground circuit to the fuel pump relay when the engine stops or is below 120 rpm.



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Oct 26, 2010 | 1993 Mercury Cougar

1 Answer

Where is the fuel pump relay located at


Usually located inside or near the fuel tank

-quote-
There are two types of fuel pumps. It may be a mechanical pump or an electric pump. In earlier days, mechanical pump was used for vehicles. The mechanical fuel pump can be found in the camshaft of your vehicle's engine. Nowadays the diesel fuel pump has become an electrical component and also is available as a small size device which can be seen inside the fuel tank. The power required for the electric fuel pump is got from the car's battery. The main function of the fuel pump is to push the gasoline to the engine by creating a positive pressure.
-end quote-
Fuel Pump

Sep 24, 2010 | 1991 Honda Accord

2 Answers

I have a 1964 oldsmobile super 88. where is the fuel pump. it has an electric pump underneath. however i replaced it and the car ran for a day. now there is no fuel to the carb. thinking of .....


OEM fuel pump was mechanical, driven by the cam and is bolted to the block

if with the replaced electric fuel pump still no fuel, then check power and ground remove the output line and check for fuel there

possible clogged fuel filter... the one mounted on the carb and/or in the fuel line to the carb.... yes there should be TWO filters!

Mar 18, 2010 | Oldsmobile 88 Cars & Trucks

1 Answer

1997 Ford F150 Electric Fuel Pump will npt pump


Did you check the fuel inertia switch in the passenger side kick panel ?

The fuel pump is powered :
the fuse to the fuel pump relay.
The fuel pump relay to the fuel inertia switch
The fuel inertia switch to the fuel pump itself.

At the fuel inertia switch in the kick panel, power from the relay is the Dark Green w/ Yellow stripe wire and the pink w/ black stripe wire is the power. from the fuel inertia switch to the fuel pump.

If you jumper the fuel pump relay, you should hear it run. If not pull the fuel pump relay, and check the pins in the relay socket, pin 30 should be the power from the fuse.

50b0c31.jpg

If you have power at pin #30, jumper the relay socket as shown with the red line above, and check the dark green w/ yellow stripe wire at the fuel inertia switch for power.
Press the button on the top of the fuel inertia switch, and check for power leaving the fuel inertia switch on the pink w/ black stripe wire.

This is tests good, check for power at the fuel pump, same pink w/ black stripe wire.
Fuel inertia switch info is in the owners manual, If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Jan 03, 2010 | 1997 Ford F150 Regular Cab

1 Answer

2001 f350 diesel craks but wont start


SOUND LIKE THE ELECTRIC LOW PRESSURE FUEL PUMP CHECK FUSE TO SEE IF PUMP GETTING POWER. IF NOT REPLACE FUSE AND CHECK THE WIRE TO PUMP.IF PUMP IS GETTING POWER..REPLACE FUEL FILTER FIRST.IF IT DONT HELP.COULD BE THE ELECTRIC LOW PRESSURE PUMP. FAULTY. IT PUMPS DIESEL FUEL IT INTO INJECTION PUMP TO BE PRESSURIZED TIMED AND INJECT.SEE IF LOW PRESSURE PUMP DONT WORK THE WHOLE ENGINE WONT RUN.THE INJECTION PUMP NEED FUEL FROM LOW PRESSURE ELECTRIC PUMP TO RUN ENGINE.

Aug 11, 2009 | 2001 Ford F350 Super Duty SuperCab

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