1990 Ford F150 Fuel Pump Relay Diagram

yo

Great pic TR!
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..." Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
Diagnostic Link Connectors for EEC-IV processors ('84-95).
'84-86 (red) located on R wheelwell near starter relay.
'87-95 (black or gray) located under L hood hinge under EEC TEST cover.

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Wiring Diagrams in 86 (INCLUDES BRONCO & Single Tank F 150); 89 (INCLUDES BRONCO & Single Tank F 150); 91 (INCLUDES BRONCO & Single Tank & Dual Tanks & Pumps F 150) & 95 F 150 w/Dual Tanks & Pumps
Source: by Ryan M (FireGuy50) at fordfuelinjection.com

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Wiring Diagram in an 89 5.0, 5.8 & 7.5
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums

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Operational Sequence; "...The computer turns on the fuel pump relay 1. For about 1 second when you first turn the key to ON and 2. when it senses rotation in the dizzy from the pickup. You should test your relays by applying 12 V across the small terminals, listen for the click and check continuity across the large terminals. This will rule out the relays themselves being a problem. Usually they ARE the problem, so hopefully you can stop there. They absolutely HATE moisture so if you are missing your cover Im sure some moisture got inside the relays themselves. The pickup in the distributor can throw a code when it is intermittent or not working. One of many reasons you should check your codes..." 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 kf4amu (Will H, The Beast) at FSB
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Overview; see page 48 in Ford EEC IV Operation & Testing Overview; PowerPoint Presentation
Source: by Ryan M (Fireguy50) at powershow.com

Consider Relay Swap to Bosch Type & Color Codes in all pre-'92 EFI Bronco & F-series
Source: by Steve83 (Steve, That dirty old truck) at FSB
Steve may have added more info for this in his SM Site

This is a common problem in all pre-'92 EFI F-series & Broncos. These Ford-style relays (BROWN socket = EEC power; GREEN socket = fuel pump)are notorious for causing intermittent failures in the EEC & fuel pumps Yesterday, this EEC PWR relay decided to lock on, killing the battery. Today, its contacts are so bad that the truck won't run. So it's about to be TRASH.

See the NEXT caption.

Working on ONE relay at a time, remove the terminals from the stock connector & discard it. I collected these Bosch-style sockets in junkyards, but they're available at most parts stores, from Ford, or several online suppliers like RJMInjectionTech.com as crimp-on kits for a near-factory look.

See the NEXT caption.
Being careful to connect the wires to the proper terminals (using the list below), securely connect the old wires to the terminals of the new sockets. Try to keep the wires the same length so there's not a huge ratnest.

EEC PWR
30 - Y (battery always 12V)
87 - Bu, DB, R (out to EEC)
85 - Wh/LB, R/LG (12V in from ig.sw.)
86 - Bk/LG, Bk (ground)

FP
30 - Y (battery always 12V)
87 - Pk/Bk, Br, DG/Y (out to inertia sw.)
85 - R (12V in from EEC PWR relay)
86 - T/LG, LB/Or (ground from EEC)

It's OK to reverse 30 with 87, or 85 with 86 on either relay.

It's possible to just use common insulated flat blade terminals to connect the bare wires to the relay terminals without a socket, but it's not as secure or convenient.

Now the truck will be MUCH more reliable, and can use the cheaper, heavier-duty, more common ISO relays that are easier to swap. Tape up the harness & secure the relays to a safe mounting location. Not all relays have mounting tabs like these, but the sockets or harness can be zip-tied to something solid.

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and. for posterity;
No Start, Low State of Battery Charge or Buzzing or Humming Noise from the Fuel Pump after the Engine has been Shut Off Caused by Sticking Fuel Pump Relay TSB 90-18-3 for 83-90 Bronco, Bronco II, Econoline, F-150, F-250, F-350, Ranger & Many Others
Source: by Ford via Chilton
FORD: 1983-1990 CROWN VICTORIA, ESCORT, EXP, MUSTANG, TEMPO, THUNDERBIRD
1986 LTD
1986-1990 TAURUS
1983-1990 BRONCO II, BRONCO, ECONOLINE, F-150, F-250, F-350, RANGER
1988-1990 F SUPER DUTY
LINCOLN: 1983-1990 CONTINENTAL, MARK VII, TOWN CAR
MERCURY: 1983-1987 LYNX
1983-1990 COUGAR, GRAND MARQUIS, TOPAZ
1985-1986 CAPRI, MARQUIS
1986-1990 SABLE
ISSUE OTHER APPLICABLE ARTICLES: None
A "buzzing" or "humming" noise from the fuel pump may occur after the engine has been shut off. There may also be a no start condition or a discharged battery. These conditions are caused by a sticking fuel pump relay. Install a new fuel pump relay. Refer to the following procedure for service details.
1. Check the fuel pump relay circuit for proper operation. Refer to the appropriate EVTM for troubleshooting details.
2. Install a new fuel pump relay, if the old one is
defective.

Source: https://www.fullsizebronco.com/threads/po-hotwired-fuel-pump.184029/

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