Question about 1998 Ford Windstar

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1cant figure out why i only get power to the fuel pump when i run a hard wire from the battery to the relay i have tested the relays and they are ok

I cant figure out why my fuel pump only gets power when i run a hard wire from the battery to the relay i have tested the relays and fuses

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  • sandybeautif May 25, 2009

    i checked the emergency fuel botton and i get preassure only when i hot wire the relay to the battery because thats the only way i can get teh fuel pump to work and build up the preassure i believe its electrical and im still looking for solutions thanks

  • sandybeautif May 25, 2009

    i just unconnected the battery and ecm then reconnected it and still no results

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  • Ford Master
  • 3,854 Answers

Did you see if the inertia switch was triggered. The emergency fuel pump cutoff switch, also known as the inertia switch, cuts power to the fuel pump in the event of an accident - even a slow speed one - any sudden "jolt" can trigger the switch. 

The switch is located inside the jack storage compartment found at the right rear of the vehicle. Remove the cover and it is behind the thin "foam" covering inside the compartment towards the rear of the vehicle. 

It has a red button on the top of the switch, make sure the button is fully depressed. If it is and the vehicle still won't start check fuel pressure at the rail (there is a port on the rail which is under the hood on the engine) with a fuel pressure gauge. If the pressure is ok (about 30 psi) the problem is most likely not fuel system related. 

Good luck and hope this helps.

Posted on May 25, 2009

  • Harvey N Tawatao
    Harvey N Tawatao May 25, 2009

    There is a "lock out" in the electronic control module. Disconnect the battery. Disconnect the control module. Wait. reconnect the control module. reconnect the battery. Voltages should be correct. 

    Try this and hope this helps. I know the ECM is what activates the fuel pump relay.





  • Harvey N Tawatao
    Harvey N Tawatao May 25, 2009


    I hope i got this right, was chatting with a friend at the speed shop.

    The fuel pump power on the windstar is controlled by a component called a Constant Control Relay Module (CCRM). The problem with this unit? The case that seals the relay and the thinking part of the module cracks and allows water to enter the unit and shorts or corrodes the terminals.



    This really goofs up the CCRM and results in loss of fuel pump control or reduced electrical supply. This condition can be a stinker to prove, because the vehicle only has to set awhile or have a ride on a wrecker and the problem will no longer be present. 


    Hope this adds some light to the windstar's problem, so you may have to run a hot wire to the relay from the battery. He said the wiring to the fuel pump system is, Battery to the relay, ignition to the relay, Relay to the inertia switch, Inertis switch to the fuel pump.


    Good luck and keep me posted.

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It is relatively easy to test the pump by connecting it directly to a known good battery, taking all appropriate safety precautions.

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Acura Coupes and Sedans 1994-2000 Repair Information

PGM-FI Main Relay

Print
This relay is located behind the dashboard's lower cover. It consists of two individual relays. One is energized whenever the ignition is ON , thus supplying battery voltage to the Powertrain Control Module (PCM). This relay also supplies voltage to the fuel injectors, and power to the second relay. The second relay is energized for two seconds, when the engine is turned ON , to power the fuel pump.
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Fig. Fig. 1: Schematic of the PGM-FI relay
Testing
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See Figure 2

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Fig. Fig. 2: PGM-FI relay terminal numbers

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