Question about Mazda B2600

4 Answers

Cant get fuel pump to come on was working but gas would not come out injectors only start when you spray starter fluid in it

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  • rhcoleman54 Mar 27, 2011

    HAVE 1990 MADZA TRUCK CANT GET FUEL PUMP TO COME ON CANT GET FIRE TO IT AND INJECTORS DONT SPRAY GAS HAVE REPLACE FUEL PUMP ,NEW COMPUTER IT WAS PUMPING GAS AT FIRST BUT STOP PUMPING NEXT DAY RUN HOT WIRE TO PUMP AND IT PUMP GAS BUT WONT START IF I SPRAY STARTER FLUID IN THROTTLE IT STARTS BUT NOT FOR LONG

  • rhcoleman54 Mar 27, 2011

    HAVE A 1990 MADZA TRUCK FUEL PUMP WONT COME ON AND WONT START ALREADY CHANGE FUEL PUMP,NEW COMPUTER BUT WONT SEND GAS THROUGH INJECTORS IF I HOT WIRE FUEL PUMP IT COME ON BUT NO GAS COMES THROUGH INJECTORS IT WILL START IF I SPRAY STARTER FLUID IN THROTTLE BODY WHAT DO I NEED TO DO OR CHECK TO GET IT TO WORK

  • rhcoleman54 Mar 27, 2011

    HAVE A 1990 MADZA TRUCK FUEL PUMP WONT COME ON AND WONT START ALREADY CHANGE FUEL PUMP,NEW COMPUTER BUT WONT SEND GAS THROUGH INJECTORS IF I HOT WIRE FUEL PUMP IT COME ON BUT NO GAS COMES THROUGH INJECTORS IT WILL START IF I SPRAY STARTER FLUID IN THROTTLE BODY WHAT DO I NEED TO DO OR CHECK TO GET IT TO WORK

  • rhcoleman54 Mar 28, 2011

    MY TRUCK IS 1990 MADZA B2600i FUEL INJECTED 2.6 L. WHERE DO I LOCATE YOUR NUMBER 1 & 3 SUGESTIONS

  • rhcoleman54 Mar 28, 2011

    tried that did not work

  • rhcoleman54 Mar 28, 2011

    yesnin turn the key on no fire coming through the connection

  • rhcoleman54 Mar 28, 2011

    yes i did turn key but no fire is in that yellow connector

  • rhcoleman54 Mar 28, 2011

    yes i check both main efi fuse and fuel relay fuse they both have fire in them but fuel pump still want come on

  • rhcoleman54 Mar 28, 2011

    yes i check both main efi fuse and fuel relay fuse they both have fire in them but fuel pump still want come on

  • rhcoleman54 Mar 28, 2011

    my truck is a 1990 madza b 2600 fuel injected could you give me the location to your number 1 and 3 suggestion you gave me yesterday

  • rhcoleman54 Mar 28, 2011

    have already install a new fuel pump , fuel filter, new computer, there is no fire in connector to fuel pump . if i run hot wire back to connector the fuel pump comes on and pumps gas up to front of truck but still wont crank only starts when you spray starter fluid in throttle body

  • rhcoleman54 Mar 29, 2011

    when i turn on key should i hear a click in fuel pump relay if it is working properly i notitce when i first put the new pump in i thought i heard a click from relay it was pumping gas the firstday but the next day it wouldnt come on

  • rhcoleman54 Mar 29, 2011

    i have a 1990 madza b 2600 truck having trouble getting fuel pump to come on and injectors to spray gas . i have already put in new fuel pump,new computer . when i first put in fuel pump it was pumping gas the first day, next day the pump wouldnt come on .check fire to pump at connector on top of gas tank it had lost fire.i check yellow connector where you can jump it under hood has no fire at connector with key on nor at tank .if i run hotwire back to pump it comes on in pump gas to front of truck but wont start.only way it do start if i spray starter fluid in throttle body.i have also check main fuse box under hood have fire in it for pump but not to tank at connector for pump what do i need to do to try to solve my problem

  • rhcoleman54 Mar 29, 2011

    i see the circuit open relay on the diagram you sent but where exactly can i find it at on my truck also would that have anything to do with the injectors not spraying gas out of them

  • rhcoleman54 Mar 29, 2011

    thanks for your help i will try your suggestions tomorrow if it dont work i will get back with you for some more ideals

  • rhcoleman54 Mar 29, 2011

    i will try your suggestions tomorrow sounds like you leading me in the right direction as to find out what my promblem could be if your suggestion dont work i will contact you again tomorrow

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4 Answers

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  • Mazda Master
  • 8,836 Answers

Hi, I recommend you check the circuit opening relay socket to see what is going on. Pull the relay out and use a 12 volt test light or voltmeter to check for the appropriate ground signals. With the test light clip or voltmeter probe on battery positive, probe the socket with the other lead. There should be 2 ground terminals--one from the black wire for the opening coil and one from the check connector. Both these terminals should light the test light. If not, trace the wires to see why. Also check all of the fuses involved, such as the engine fuse, EGI fuse, and room fuse.

cant get fuel pump to - jturcotte_1359.gif

Posted on Mar 29, 2011

  • Jeffrey Turcotte
    Jeffrey Turcotte Mar 29, 2011

    The relay should be in a box in the front of the engine compartment on the passenger side. The check connector is also there. The main relay powers the injectors, so I believe they are getting power. The question is, 'why are they not getting the ground pulse from the PCM?' Tell me this, can you hear the injectors clicking when you crank the engine? Try holding a long screwdriver to one of the injectors and hold the handle to your ear while someone cranks the engine. See if you can hear them click. If they are clicking, they may be clogged.

  • Jeffrey Turcotte
    Jeffrey Turcotte Mar 29, 2011

    OK, I may be in the field tomorrow, but i will check messages when I get home.

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  • Master
  • 1,016 Answers

Hi,
If you can give me the year and model, engine size of your vehicle would help. But in conclusion it sounds like you have one of the following problems: 1. Faulty injector pump relay. 2. Your crank angle and/or camshaft sensor is faulty. 3. Your power supply to the injectors module is faulty.
Let me know if you need more help.
Thanks
Jason

Posted on Mar 28, 2011

  • 4 more comments 
  • Jason Maurirere
    Jason Maurirere Mar 28, 2011

    First check that the fuel pump is operating correctly by bridging the yellow connector which you will find against the firewall on the right hands side. disconnect the hose from the fuel filter side and test the pump is working correctly.

  • Jason Maurirere
    Jason Maurirere Mar 28, 2011

    Did you turn the key on?

  • Jason Maurirere
    Jason Maurirere Mar 28, 2011

    Ok, Check the main EFI fuse first and also fuel relay fuse. These are found in the main engine fuse box.

  • Jason Maurirere
    Jason Maurirere Mar 28, 2011

    Check the wiring at the fuel pump connector which is on the top of the fuel tank. When you turn the key on you should have something, if not then check while cranking the engine if still nothing then check the fuel pump relay.
    If you have power at the fuel pump connector then your fuel pump is faulty and needs replacing.

  • Jason Maurirere
    Jason Maurirere Mar 28, 2011

    Ok so you have 2 problems here. Not power supply to the fuel pump as well as no injector pulse happing at the injectors.
    Firstly you need to get the fuel pump operating correctly first then you can look at the issue of no injector pulse. So check the power supply to the fuel pump relay, if there is power to the relay check there is also power when the ignition is turned on. If this is happening replace the relay, if there is no power then you need to check the wiring circuit between the fuel relay and the fuse box and the ignition switch. Let me know what you find.

  • Jason Maurirere
    Jason Maurirere Mar 30, 2011

    Yes you should hear a click from the relay when you turn the key on.
    But you need to make sure there is power coming out from the relay.
    It may have dirty contacts in the relay as to why no power is getting to the fuel pump.

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  • Mazda Master
  • 17,970 Answers

To begin, all engines using fuel injection do in fact require some slightly different fuel system maintenance! The normal wear and tear with today's underhood temperatures and changes in gasoline quality suggests some buildup of olefin wax, dirt, water and many other additives. Unique to each engine is an air control design that also may suggest different levels of carbon deposits, such as oil control or just the location of the component or control device itself.

To simplify the approach, I will use the word "service" since the phrase "injector cleaning" is misleading as to the real function needed to maintain the vehicles of today!

Fuel Injetor System Service
(Note the words "system" and "service" in the subtitle, and not "cleaning!")

The proper steps in fuel injector system service are:
* Check fuel pump operating pressure and volume.
* Test pressure regulator for operation and leakage.
* Flush entire fuel rail and upper fuel injector screens to include pressure regulator.
* Clean fuel injectors.
* Decarbon engine assembly.
* Clean throttle plate and idle air control (IAC) passages.
* Check minimum air flow rate and adjust if needed.
* Relearn onboard computer.

All eight steps may be performed using one of the "two-line" fuel injector service units. (Carbon Clean, Injector Test, DeCarbon and Motor-Vac, to name a few.)

Check fuel pump operating pressure and volume
The missing link here is volume, as most working technicians assume that if the pressure is correct, the volume is OK also! By hooking up a fuel pressure tester to the fuel rail inlet and return, and using the pressure side feed t-Ed into the fuel unit, we can quickly test the fuel pressure with engine running but also at the same time test the volume of the pump by stealing fuel into our holding tank (one pint in 30 seconds is the usual specification). When proper volume is flowed into the tank, we would shut down the engine and change hose connections to allow the machine to be put in control of the fuel supply system. The two line system would be attached to inlet and return on the fuel rail, with the vehicle's onboard system being "looped" and returning fuel to the tank. This prevents disabling of the factory unit.

Test pressure regulator for operation and leakage
At this time, the regulator would be tested for operational pressure and proper regulation including leakage. (This works well as the operator has total control of rail pressure with the unit control valve.)

Points to Ponder:
* Good pressure doesn't mean proper volume! Example: A clogged filter may test OK on pressure, but restriction may not allow proper volume under load!
* There is some logic to using the vehicle's gasoline to service the system as opposed to a can of shop gasoline that has been around for some time!
* Pressure regulators do fail and a lot more of them don't properly shut off the fuel, causing higher-than-normal pump wear and shorter life!

Test it and keep us updated.

Posted on Mar 27, 2011

  • ZJ Limited
    ZJ Limited Mar 28, 2011

    Try to check with the sparkplug order, 1990 Mazda B Series Truck 2.6 liter SOHC L4

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  • Master
  • 3,530 Answers

Welcome to Fixya

Sounds like you need to replace the fuel pump. Here's a simple procedure to test your fuel pump.
Please let me know if you need further assistance.

Thank you for using Fixya!

Posted on Mar 26, 2011

  • Jose Cada
    Jose Cada Mar 27, 2011

    Check the fuse of the fuel punp and check also the relay. Replace the fuel filter also if necessary

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