Question about 1991 Ford Mustang

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Power to fuel pump on 91 ford mustang cobra 5.0

91 ford mustang cobra 5.0, fuel pump and relay is working but no power going 2 fuel pump even bypass inerita switch in trunk still don't start unless I run straight power to fuel pump what else can I try or do?

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The ignition module sends a "pip" signal to turn on the fuel pump and keep it running. If the signal is lost, or not present you get no pump. This is a safety in case of accident or other hazard in order to shut off the fuel so it wont keep pumping into a car with the key still on but engine disabled for some reason. Take the module to your local parts store and have it tested, for free to check.

Posted on Sep 30, 2009

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Check under your drivers side seat look for a relay replace it.... thats where mine was under the seat but some newer foxes had them in engine bay on left apron I believe. Power to fuel pump on 91 ford mustang cobra 5.0 - power-fuel-pump-91-ford-mustang-cobra-d2rqdt5d3kr2zlgmbqd4v0hj-4-0.jpg

Posted on Jan 07, 2015

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Do you have voltage at the inerita switch? Sounds like you have a broken wire or bad connection. You are going to have to trace the wire back and see where it is that you loose the voltage.

Posted on Sep 30, 2009

A schematic would help ,as involved as you are. Maybe a Ford Tech will read your question

Posted on Sep 30, 2009

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How do you know the fuel pump is not getting power?.The fuel pump only comes on for a second or two before cutting back off.The ecm only suppys power to the relay for a few short seconds with key in the on position.Only constant 12 volts is supplied when the engine is running.Is the fuel pump new?How do we know it is good?Also is the engine giving a spark when the engine is turning over?If the engine has no spark,then the pick up coil could be bad,otr the ignition module could be bad.Check the fuel at the injsctors or a fuel line to see if the fuel will pump out when the key is turned on,if it does not,then check to see if the ijectors are pulsing.If the injectors are not pulsing ,and you have spark,then remove the distributor and replace the pick up coil,and the ignition module.The pick up coil,along with the igniyion module give the injectors there pulse.One other thing,If the fuel pump is not for sure coming on,check to see if the relay is clicking on,and then off in a couple of seconds.If this is true,then replace the fuel pump.Any other questons,please ask,I will try to help if I can.I hope this was some help,let me know,thanks.

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Fuses and Circuit Breakers Location and Values
NOTE: The headlamp switch (11654) has an integral 20-amp circuit breaker.
  • The combination instrument panel fuse and circuit breaker panel contains most of the fuses and circuit breakers used in the system.
  • The fuses and circuit breakers are color-coded by amp rating.
  • The locations and values of the fuses and circuit breakers not contained in the panels are shown in the following chart.


Circuit Circuit Protection and Rating Location Headlamps and High Beam Indicator 20 Amp. CB Integral with Lighting Switch Heated Back Window 16 GA Fuse Link Engine Compartment Power Windows, Power Seat, Power Door Locks 20 Amp. CB Starter Motor Relay Load Circuit Fuse Link In Harness Engine Compartment Lamp Fuse Link In Harness Convertible Top 25 Amp. CB Lower Instrument Panel-Reinforcement


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Cavity Number Fuse Rating Color Circuit Protected A 40 Amp Orange
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B 40 Amp Orange
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C 40 Amp Orange
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D 50 Amp Red
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  • Instrument Panel Circuit Breaker 12
E 20 Amp Light Green
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  • Fuel Pump
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  • Canister Purge Solenoid
  • EVR Solenoid
  • Ignition Control Module (3.8L)
  • IAC Solenoid
  • Fuel Injector
  • Automatic Transmission
  • Camshaft Position Sensor (3.8L)
  • MAF Sensor
F 40 Amp Orange
  • Heated Back Window
G 20 Amp Yellow
  • Fuel Pump
H 60 Amp Blue
  • Fan Control
J — — Not Used K 10 Amp Blue
  • Anti-Lock Brake Control Module
L 20 Amp Red
  • Fan Control Monitor (PCM)
M 25 Amp Yellow
  • Horn
  • Foglamps
  • Daytime Running Lights Control Module
N 25 Amp Clear
  • Fuses 5 and 9
P 20 Amp Clear
  • Radio Amplifier
Q 20 Amp Yellow
  • Generator
S 30 Amp Yellow
  • Convertible Top Motor
T 60 Amp —
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1 Answer

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1 Answer

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