fuel pu,p?

[nine milly]

ok i thought i was all good replacing the high pressure pump on the frame rail and the fuse under the hood i still have no pressure at the fuel rail at the valve i really don't want to do the one in the tank but i think that might be the problem any suggestions would be greatly appreciated..

 

[nelbur]

Is the pump on the frame rail running for a second or so when ever you turn the key to the on position? If not you might have a fuel pump relay problem.

 

[Bronco Kid!]

yeah check your relay first if you have one, on my bronco i have a fuesable link, and if thats not the problem then make sure you key on and of about 6 times to prime the system then check for pressure..

 

[miesk5]

yo,

You have a 89 and a 91, correct? So w/ 2 pumps this prob is w/the 89?

And you have had issues w/no headlights, etc at times and lose them or get them back on when running over a bump in the road? Was this ever resolved?



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 PIP signal from the Hall-effect devices, it continues pump operation even after the key is released from START. If the PIP 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 Steve83

Also do a Self Test for Codes by our friend here, BroncoJoe19 @ http://broncozone.com/topic/14269-code-reader/page__pid__74587__mode__threaded

An assistant to write the info is helpful

turn off all accessories/lights, etc.

Make sure A/C is off and transmission is in Park (automatic)

Do Key On Engine Off (KOEO) portion

Look Codes up in my broncolinks.com site using the new Search function if in a hurry today.

And Post em here

Check for power at Fusible Link

Oveview of tips; PIP sensor in distributor. The PIP sensor supplies the timing pulse to trigger the TFI and injectors. a noid light will tell if the pip is working by flashing when the engine is cranking.

ECC relay failure, 86-93 models only: ECC relay - look for 12 volts at the fuel injector wires

A, F, G, J, L, M, N, P, W & Y Location in Wiring Diagram in an 89; Fusible Link A-Brown 18ga to Rear Window Defroster; W-Blue 20g to Fuel Pump Relay; N-Blue 20g to EEC Power Relay; F-Blue 20ga to Trailer; Y-Blue 20ga to N.C.; L-Brown 18ga to ?; M-Brown 18ga to ?; G-Blue 20g to Exterior Lamps, Trailer; P-Blue 20ga to ?; & J-Green 14ga to Alternator Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums

, EEC Power Relay and then to FP Relay

Then @ Inertia Switch

Wiring Diagram in a 91 (INCLUDES BRONCO & Single Tank F 150) from Electrical & Vacuum Troubleshooting Manual (EVTM) Source: by Ford via Ryan M (Fireguy50) at fordfuelinjection.com

Wiring Diagram in an 89

FP Relay Location; "87-91 fuel pump relay and EEC Power relay are behind the air filter housing."

Source: by Ryan M (Fireguy50) at fordfuelinjection.com

Relay, EEC Power (BROWN Connector) next to the FP Relay (GREEN Connector), Trailer Tow Relay (Grey Connector) & EEC Test Connector pic in a 90; same for 89-91; on driver's side fender apron to the rear of the Airbox



And at pump

Check ground on rear crossmember

Source: by SeattleFSB (Seattle FSB) at SuperMotors.net

 

[nine milly]

thanks for all your help guy it turned out being one on the wires that plugs into the relay i figure that i would start testing with a volt meter as i pulled the relay up the wire fell out of the back so i shoved it in turned the key and it started right up again thanks to all

 

[nine milly]

Ok i thought it was the connector but nope im only getting a few volts to the fuel pumps i cant feel the rely kick on i replaced the high flow fuel pump the rely and the connector that the rely plugs into when i was messing around with it yesterday i turned the key and they kicked on and started right up today nothing again help..

 

[swampthing]

are you getting power to the pumps? if you replaced pumps and relay and getting the problem again check them for power...if you got nothing and as miesk5 had posted about your light problem you could have a short somewhere in the wiring...i know i personally had a lot of problems with the relays i always carried spares.

 

[nine milly]

I don't have a light problem. There is only three volts going to the high pressure pump...... Do both pumps run through the relay?

Could it be possible for the wires to be shorting out near the pump in the tank?

 

[miesk5]

I don't have a light problem. There is only three volts going to the high pressure pump...... Do both pumps run through the relay?

Could it be possible for the wires to be shorting out near the pump in the tank?

yo,

Both pumps are fed from relay

Do the KOEO self test portion anyway.

Here is a wiring diagram; should be = to your yr

 

[nine milly]

ITS ALIVE lol i figured it out with that wire diagram thank you very much the new connector that i had got through C&C ford where at on time i used to work they had the wrong color wires on there too of them were reversed compared to the original i switched the two wires around fuel pump kicks on second crank its alive thank again for all y'all help www.broncozone.com my new favorite site...