Question about 1989 Ford Bronco II

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Fuel Pump Relay

My bronco has the same problem of not cranking and sometimes cranking but going dead. I tested with a diagnostics machine and it said the fuel pump relay was bad. My problem is that I can't find where it's at to replace it myself. Can someone explain to me where to find it?

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  • mandybarton3 Sep 22, 2008

    It's a 1989, 6cyl



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Relay should be under the hood on the driver side either in a fuse box or by itself next to the fender

Posted on Nov 08, 2008


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2002 suzuki aerio fuses

you asked 3 times, now.. why?
why not add to 1 post, click comments,! and win.
what is a description.????
why not post problems first. put helper on same page??????
if that happens we know what you need, and correct pages.
my book has 7000 pages.
why must I guess.?
i guess you've never seen a service manual>?

it's just one relay
and the PCM runs it.!!
if the pump has 0vdc cranked,
we scan the PCM first.
not play with relays.
if the pump has 12vdc cranked, then the relay and PCM
is happy. end relay hunt......

it is that simple, but did you crank it first?
takes 2 man test (2 woman)?
the Suzuki laws of PUMP: world wide.:
1/2 the SUZUKI PCM do not run the fuel pump until cranked,
others run only for 3 second keyon and full time cranked.
that is a RULE:
can you run to rear of car crawl under in 3 seconds?
i bet not.
why not post the symptoms first. the ask for clear
accurate diagnostic help.

no crank.?
no start
sparks dead (if dead, rule 2,ecu cuts fuel, by LAW)
fuel pressure 0 cranked.
engine bogging
engine misfiring


Mar 20, 2017 | 2002 Suzuki Aerio

1 Answer

I parked my car in the parking area at work but when I came back to start it it's only cranking and no fuel going to the injectors. I changed the pump and it's still the same 320i.2010

Fuel pump relay , or fuel pump control module . The way to test is to do voltage testing . Also check engine computer for DTC'S diagnostic trouble codes ! What make vehicle ? BMW ?

Feb 06, 2016 | Cars & Trucks

1 Answer

I have no power to my fuel pump in my 2006 jeep liberty, I've put a new pump in, checked all the fuses and relays, and put a new crank sensor In. I still don't have power to the pump

ouch, you dont have a $10 volt meter, ? if you dont have 12vdc to the pump cranking why replace a pump, it has no power. so.....?
which engine, we need that because its and EFI question and varies by engine. Gas or Diesel?
first off here is the dead pump checks on all EFI cars,
1: fuses are first (as is a charged battery to 12.6vdc rested)_
2: next is to scan it, scan it cranking, dont skip scans. ever. and 100x that in newer cars. it reports many failures, now. details......
3: the crank engine (yes, crank it ) and see if 12vdc makes it to the pump. does it? id bet not. (as you said no power but did you crank it?)

4: if the pump feed wire is dead now what. well check the pump drive. on old cars its a relay on newer its ELECTRONIC driven.
that means powerful transistor drive from the TIPM.
5: first is if the SKIM is glowing cranking is it? immoblizer active cuts fuel. (not sure if it cuts pump but is important this)
6: dead ASD relay, it dont close. cranking.
7: or the ASD relay drops out cranking, scan tool tells why.

me ?, I scan first, ohm the scan tells me x fuse is blown,.
or that the ASD dropped for x reasons 8 total.

does the PCD Fuel pump relay close cranking?
does the coil on said relay (meter across coil of it) go to 12vdc cranking 11v is typ.?
if not the ECU is blocking the pump relay,
that takes a scan tool to find why.
use an Innova 3160 scan tool , buy one and save a fortune guessing.
barrow, rent or buy,
cant go to shop engine is dead, right? so leaving 2 choices.
tow it or buy scan tool for less. cash.

fuse 24 looks ok but is cracked (hair line) and reads infinity on the ohm meter RX1 scale.? BINGO, we test fuse that look ok.
or check voltage on both sides of fuse cranking, 12vdc is good.
0v is bad.

The PCM has many reasons to cut the relay,
not one can be guessed at (well dead spark, sure)
it needs to be scanned.

Apr 08, 2015 | Jeep Cars & Trucks

3 Answers

No power to the fuel pump

Maybe this will help ---

Also check the fuel shut off switch since you do not have power.


Jan 08, 2015 | 2002 Toyota ECHO

1 Answer

Where is the fuel pump inertia switch on a 1993 geo prizm?

there is none. (why not post symptoms and let test find cause?)

toyota Corolla. is same.
4AFE engine
7AFE engine. always know what you have first. before diagnosing
NO transmission stated, making pump diagnosis hard.
engine problems. (no starts?) is that it?
is fuel pump dead, that it>?
the car has a Fuel pump relay, only
and is controlled by many things,

the 4a engine, the Clutch or A/T tranny ignition ACTIVE wire,
feeds the Fuel pump relay , if the FP relay drops out ?
check voltage on both pins on the FP relay.
one side is grounded other is 12vd key on. if not , you lost power to it.
fuse blow? is 1st on all electrics, and same with EFI
im in the FSM and it shows no Inertial switch in the schematic.
but i see some sell it. for cars not in the USA. so????

let me now guess, the true post.
car will not start. but runs for 3 seconds on test fuel
owner cant hear pump
so find 0v across the pump cranking,
so the Fuel pump relay is dead. (not bad just dead)
why, so he finds the car is A/T tranny and checks the PRNDL switch there and is bad, or not bad and find the wire to it dead.
he finds a connector to the PRNLD bad. kiling the pump relay.
got a voltmeter? this is easy
check pump voltage cranking.

May 03, 2014 | Geo Prizm Cars & Trucks

1 Answer

2001 acura mdx wont start. cant hear fuel pump.

going backwards, ? (yes, i to check volts first) but...
you check fuel pressure cranking, (is press in spec or not?)
the FSM covers this, 1/.2 the cars only get pump activation,,
cranking and running, never just key on (the fsm shows this fact, i didnt look for you)
Yours is older loop system, not dead head.
there are 5 test just for the pump, (actually more)
pressure cranking and running, (leakdown test and injector balance tests and shut test for loop version) on V6 that 6 +4 ,10 total tests.
once the gauge is in place we do all 10s tests on v6.

ok say my pressure spec. is 40psi cranking and i get 10.?

spec: 32-40 running, pSI, vac, hose conn. (cranking will be more)
in loop systems the cranking pressure is about 10 PSI more.
after it starts, the vacuum sucks pressure from say 50psi to 40.
(its also altitude compensating)

Voltage checks, (any voltmeter)
use a voltmeter to see if full power reaches the pump.
i check voltage and its 8v. (bad) cranking volts can be near 11v due
to battery load, 200amps or so... what i do is measure battery crank
voltage and expect same to pump , using the 0.5v rule. (drop)
the connector over here to pump is all corroded. ,,
fix that and bam, now full presssure
or i find a bad fuel pump relay, replace that and bam.
or i find 0v, to pump.
i find relay bad. (simple tests on relay) (its not bad ECU)
ok i find 12v. at pump. so what is wrong?, i check my fuel pressure
regulator at the fuel rail, its stuck wide open because the shunt test
passed (one of 4 tests above) so new reg and bam, 40psi to rail.
i can test the reg with my hand vacuum tool that all shops have.
i can see pressure, running and cranking and check fuel pressure
with no vacuum (50psi?) then pump it to say 20 "hg (simulates idle)
and see 40 pSI, and check the diaphram for leak down.
my reg was bad.
there are other tests:
1: fuel pump current. (if excessive, its a bad pump)
2: scope test or use a current probe on pump and see it spiking
like made, , it has bad commutator and will die so.

there great videos on all this at. Duane's site.

check the pump cranking

do not hot wire the fuel pump relay
if you slip 1/.8" you blow up a nice $400 ECU, (or more)
the ECU drives this relay (with a transistor, you dont want to explode)
if you feel compelled to hot wire things, disconnect the pump
and hot wire that.
now the relay.
it has 4 pins 12vdc in, 12vdc out to pump (contacts)
and 2 coil pins.
you put your meter to coil pins (across) i get 12v to coil cranking and running, that is the ECU working right
i get 12vdc in and zero out the contacts, the relay is bad.
lets say you see 3v out, that can be a shorted pump. or wire grounded out to pump. I check the current with my amp clamp and see 15amps
the pump is bad. most draw 4-6amps. normal.
i keep an open mind, what is bad, its only the pump 1/2 the time
or less. maybe 1/3? (reg, pump, wires and friends)
corroded connectors big time...some even burned up.

Feb 09, 2014 | 2001 Acura MDX

1 Answer

Turns over but no start

WHAT ENGINE ?????? 4, 5.2 or 5.9 Liters?
Fuses are First, always for ever. on electrics or EFI.
dry rail cranking ! you must crank it.
(if you have liking injector or leaking regulator it can drop fast ,so crank on) yes, 2 men or 1 and small boy, LOL
so check voltage at the pump cranking. please stop guessing.!

the ECU commands up the PUMP , cranking or running
so crank and read voltages at pump or at FP relay.

pump activating, is by premissives. not just a key on event
due to crash and burn rules. (unlike on TV)
same with injection. (spark must be good)
first , buy your self a voltmeter (DMM/DVM) its a very easy tool to use
and on volts, mode, totally harmless to you or car. !!!

be aware, that on some cars
if there is no spark, there is no fuel pumping
or it might take a second to detect no spark and the pump is cut
or on one of my cars the pump works the engine starts for 1second
and the ECU sees no spark (dead tachometer ) even though spark is
good the ECU sees no spark and ALL fuel is cut, injectors and fuel pump relay ( you never monitored the action of the relay?. and its dead.? i bet?) spark monitoring can fail with good spark, !!!
the path, on all cars.............. pins and colors change to confuse...
the FUEL pump relay is in the PDC
it has 4 pins, its just a 4 pin std, relay.
a coil and a contactor
if the coil is not HOT (12v across the coil) cranking
there will never ever be pump action.
so the first test is to check the PUMP relay coil wires.
the coil hot side is 12vdc key on
the other wire, marked. C20 DB (dark blue?)
it is 12v keyon
and when you crank the PCM grounds this wire and it must go
to 0v, (0.5v max) if not the PCM is in CUT FUEL MODE.
99.999999% sure, its not a bad PCM. see?
if this line dont go low you must find out why the PCM is in cut fuel.
this is pretty easy,its called a scan tool. got one
they only cost $9 (ask)
if the coil is hot at C18 relay pin and 0v at C20
this state the Relay is energized.
so we check pins C16 and 17,of said relay
we check C16 first. its 12v even key off, hot at all times if not, the fuse is blown. (or battery totally dead)
then crank and pin C17 goes hot(note my order of testing, its not random) C17 dead, is bad relay, C17 12v, cranking is dead pump.

C17 is DG/wht wire, (darkgreen.with white stripe?)
if this wire is cut the pump is dead
so is the pump dead, if hot this wire is, and the pump ground wire is cut.
when i say cut that means cut or corrosion,etc.
eg; gross resistance in the path.

takes 4min to show, and longer to type this...
the G305 pump ground black must not be bad. (12v on black wire is just that while cranking)

i will not fully cover PCM permissive on the pump.
but will do so in short.
1: ECU sees spark loss, for any reason.. even when good real.
All ECu do this differently. many read the spark coil primary
wires of inductive (EMF) kickback , on one or all coils.
other cars its just the tachometer signal dead.
2: CMP errors (cam sensor)
3: CKP errors. (crank sensor)
4: TPS stuck at WOT , usually only cuts injectors.. (unflood mode)

ive built and programmed PCMs from scratch and am aware of all pitfalls here. am.
if have the drawings, ask.
or log in to

again, connect the $9 scan tool
crank for 5 seconds. (min) max 15)
does RPM roll from 0 to near 300? no? bingo.
does DTC 340 or 350 store as you crank or release key
and do not turn off key, wait 1 second, see if DTCs are stored
in the PCM looking with any scan tool made..
if yes, BINGO !!!!

Nov 30, 2013 | 1998 Jeep Grand Cherokee

1 Answer

I replace the fuel pump in my 1990 full size bronco and now I cannot get it to crank. The reset button is depress, the filter is new, and new feul is in the tank. Pleas let me know what else I need to...

Your ford should have a schrader valve in the fuel rail for testing fuel pressure. You shouldn't need to remove a fuel line. On the left inner fender there are two, maybe three relays, usually encased insome type of enclosure. The relay with the green plug is the fuel pump relay, the relay with the brown plug is the EEC relay. Unplug both of these relays and inspect for corrosion, broken pins, and corrosion. A problem with either relay will cause the fuel pump not to run as the EEC relay controls the fuel pump relay. Corrosion at these connections has been very common at my shop.

Sep 05, 2011 | 1990 Ford F150

2 Answers

1990 bronco not getting fuel

fuel pump relay tends to short out its on the driver side fender well inside the engine compartment. also check fuel pump and sprk from the coil pack

Jan 30, 2009 | 1990 Ford Bronco

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