ford bronco

[bek]

have a 1990 ford bronco full size having prombles out of the fuel pump took tank off pulled the pump hook it up to the battery an it run, so put it back on an it wont run

 

[miesk5]

yo BEK,

WELCOME!

Please check for Codes;

SELF TEST - COMPREHENSIVE & Connector Location pics, Bronco & Ford; "...The self-test plugs were mounted on the passenger side fender on 1985-86 EFI trucks; The self-test plugs are located along the driver's side fender behind the air filter box on 87-95 EFI trucks..."; miesk5 NOTE; Self-Test Output (STO) is the Pin in the Lt gray Connector and Signal Return Ground (SIGRET) is Pin E in black Connector in 87-95; The engine temperature must be greater than 50°F (10°C) to pass the KOEO Self-Test and greater than 180°F (82°C) to pass the KOER Self-Test if you can get it to start & Run

Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accesories/lights, etc. Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch. Do Key On Engine Off (KOEO) portion first. 

post em here
Source: by our buddy, BroncoJoe19 (Joe) at http://broncozone.com/topic/14269-code-reader/

Test & Diagram at the Diagnostic Link Connector in 84-95; "...Connect FP Relay to any ground to force the fuel pump(s) on when the key is in RUN..." MIESK5 NOTE; from Ford EVTM; The Control Module (PCM) runs the pump{s} for one second when it receives an ignition- on signal. It also runs the pumps as long as it receives a PTP signal from the Hall-effect devices, it continues pump operation even after the key is released from START. If the PTP signals fall below 120RPM, the control module cuts off the signal to the fuel pump relay or the integrated relay control module. The pump will also run when the terminals of the fuel pump test connector are jumped. the Control module signals the pump when it receives a CRANK signal, and when the Control module gets PIP signals that the engine is running. the pump does not run if the PIP indicates the engine is not running even with ignition ON {except for that first one second}.
Source: by Steve http://www.supermotors.net/registry/media/245234

In your year, the FP relay is Green and EEC Power Relay is Brown
Look @ wire colors, assuming a po or shop didn't rig it up
here is a wiring diagram showing both Relays;

Wiring Diagram in a 90
Source: by Seattle FSB at http://www.supermotors.net/registry/media/854315

Fuel Pump Relay Location in a 90; on driver's side fender apron
Source: by Seattle FSB (SeattleFSB) at http://www.supermotors.net/registry/media/863653

Fuel Pump Relay Test

http://easyautodiagnostics.com/ford/relays/fuel_pump/testing_bad_relay_1.php

Testing the Ford EEC Power Relay
(Brown Relay)

http://easyautodiagnostics.com/ford/relays/eec_relay/eec_power_relay_1.php

typical issues are;

 "...You will need to trouble shoot the circuit to see if it is a EEC or FP relay, the inertia switch or corroded wiring, relay sockets, etc.
Source: by miesk5 at Ford Bronco Zone Forums

DTC 87 - FP relay circuit failure; suspect inertia switch, fusible link, FP relay
 

DTC 95 - bad ground or always on. Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM

 DTC 96 "check batty cables, connectors, grounds for corrosion; check voltage @ pump, etc..."