Question about 1993 Ford Bronco

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Fuel pump started my truck, turned over and died in seconds, but will crank. changed relay switch, pushed trigger switch until the red did not show and still will not turn over

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Sparking plug or fuel pump

Posted on Jun 01, 2009

  • haider alharbi
    haider alharbi Jun 01, 2009

    sparking plug or fuel pump

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Posted on Jan 02, 2017

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2005 neon cranks but dies after about 20 seconds. We changed fuel pump same thing changed crank shaft sensor same thing changed throttle body sensor same thing


Check fuel pressure at the injector rail. Watch it until the car dies. Also check to make sure injectors are not shutting off. Should be clicking as you try to start, even after the car dies. Could be a fault in the security system.

Jun 15, 2017 | Cars & Trucks

1 Answer

Put on new fuel pump got pressuer but want stay cranked


Your post is lacking any detail. However, if you are stating that the engine starts after being cranked but dies out (wont stay running) there are 2 ways the fuel pump is activated. When the key is first turned on, there is a 5 second fuel pump run (the ECM energizes the fuel pump relay). After the engine starts, the fuel pump relay will only stay energized when the oil pressure switch closes keeping the fuel pump relay on (oil pressure is above 5-7 psi). If the oil pressure switch is faulty or there is no oil pressure, the engine will stall just after starting.

Apr 10, 2014 | 1999 Chevrolet Astro

1 Answer

I replaced the fuel pump on my 2004 1500 5.7 liter. Started at first but only ran at idle for a few seconds and died. Now i have no fuel pressure at all. Also the wiring connection at top of fuel pump


gotta start with the color code of the wiring. verify that is correct first. you have to have fuel pressure for it to run obviously so make sure you wired it correctly. Here is the color code according to Mitchell OnDemand
black/orange= ground for fuel pump
orange/red=power on for fuel pump(only gets triggered from fuel pump relay)
dark blue/white= signal to pcm for fuel level
dark blue/ dark green= ref voltage

If that is ok then check for relay activation. Fuse 17 is the power source for that relay. If you have a good fuse but no relay activation you could throw a relay at it but if that doesnt do it then its gotta go to a shop. But if you are curious....
Relay code
pin 30= hot at all times
pin 86= relay control trigger from the pcm
pin 85= hot in run or start
pin 87= power source to fuel pump.(i.e. orange/red wire)

the relay will have numbers on it designating the correct pins. Get that right first then move on to the next. I'll be here. Good luck!

Feb 12, 2013 | 2004 Dodge Ram 1500

1 Answer

1998 chevy astro van sometimes works, sometimes not.? At timesm rarely, the astro will crank but will not start. Fuel pump not cycling and making its hum noise so I changed the fuel pump with an AC Delco...


When you first turn on the key, no crank, the fuel pump should run for a few seconds then stop. There shows to be an oil pressure switch in parallel with the fuel pump relay. It's just a redundant power supply to the fuel pump. Once it cranks enough to bring up oil pressure and the switch closes, the pump will run even w/o the relay. Both the fuel pump relay and oil pressure switch get voltage from the ecm b fuse.
At the fuel pump connector, check voltage and ground, when problem is ongoing. Gray wire is voltage--black wire is ground.
You could pull the fuel pump relay, use jumper wire between terminals on load side of relay. The load side is that line with arrow head, when energized that line moves to the other terminal. As you can see, the orange wire is hot all the time, the gray wire carries voltage to fuel pump. If it runs with jumper, then check control side of relay, the control side has to have voltage and ground, dark green wire with white tracer is voltage comes from pcm. The black wire is ground.
astro fuel pump-qgwxdgfz1nju2hdotm0lfflo-4-0.jpg

Mar 13, 2017 | Chevrolet Astro Cars & Trucks

1 Answer

On frist attemp to start car, cranks then dies after few seconds ckd fuel rail , had no pressure , replaced fuel pump regulator , no help !


do you hear the fuel pump turn on when you turn the key to the run position? If not the check the fuel pump relay.

If the car will start and run for a few seconds then die, It may well be the crank position sensor.

Nov 01, 2010 | 1990 Buick Regal

1 Answer

Car starts and cuts out after 2 to 3 seconds. fuel


When the ignition switch is turned on the pcm turns on the fuel pump by energizing the fuel pump relay. The PCM keeps the fuel pump on as long as the engine is cranking over or running.It does this by recieving pulses from the ignition module. If there are no referance pulses the PCM will turn the fuel pump relay off in 2 seconds with the ingnition on.

Most models also include a secondary control path through the oil presure switch witch will turn the fuel pump on after it detects oil presure.cranking time will be longer if the fuel pump doesn't recieve current until oil presure switch contact is closed.

Jan 28, 2010 | 1998 Chevrolet K2500

1 Answer

Describe your 2007 Jeep Wrangle2007 Wrangler


USA car
what engine???????????
wiki
2.8L VM Motori RA 428 Diesel I4
Complete engine specs[show] 3.6L Pentastar V6
Complete engine specs[24][show] 3.8 L EGH V6
times the starter will continue to run until key is turned off.
that is starter relay bad or the puter running it gone nuts.
or bad starter
next time when starter latches up, pull the relay
if it kills the cranking its bad relay or puter
if not, bad starter. all in 1min work..
and a very very serious first ORDER fix first problem
runs on test fuel. but you failed to keep it running for the 2 -3 second JEEP RULE.
if you had here is the results. (logic) hard.
1: i can keep it running with spray need a video?
yes, means ASD is not dropping out
2: no? ASD is killing the engine on purpose. and scan tool told you.

cranks no start
you said,
"No codes." if really true , there is no fuel pressure.!
if not true, its done wrong. so scan correctly THIS time.
is the skim light glowing in the dash cluster, if yes, it will not start
by DESIGN. SKIM is the immobilizer and DOES!

you must scan WHILE l its failing, not after, WHILE.
HOW TO SCAN correctly on JEEPS, (no starts)
key on, see scanner working? now, it must, if not ask.
crank or 5 seconds, (1 potato , 2 potata, 3,4,5.
release key, ( 4 and 5 are overkill but why not?)
do not turn key off or say 2 minutes, get PCM time to REPORT.

scan (2008 or newer scan tools work, CAN-BUS certified)
the tool then tells you why the ASD RELAY dropped killing starting (by DESIGN)
try to know SKIM is and option, so.... me blind can see car
http://jeepdied.com/ASD.html

runs on test fuel longer that 3 seconds, by hand, means.
all is working mostly, the fuel pressure gauge needs a jeep hose kit to work so/....... the pump needs power to work,



now the acid tests
i have 2. acid tests lacking a real scan too;..
spark timing light connected up.
you crank and spark dies, AFTER 2-3 seconds into crank/start
cycle means ASD dropped.
connect meter to injector 12vdc power feed its a daisy chain
12vdc dies, at 3seconds of crank, or dies
at 3 seconds of running,
if true PCM did that , and is ASD drop doing that
running any jeep for 1 second on test fuel is a waste of time
it tells too little
learn that jeeps can drop a ASD at 100mph
any time it wants. and only scanning while it drops
tells you why, unless the SKIM lamp glows,

Mar 03, 2017 | Jeep Wrangler Cars & Trucks

2 Answers

Installed new fuel pump on 1995 gmc sonoma, still won't crank. Will turn over but not crank. Put on new alternator also.


Check the fuel pump relay.
Check the fuel pump auto shutoff switch, push RED reset button.

Apr 09, 2009 | 1995 GMC Sonoma

2 Answers

Car will crank then cut off??????


Look in the trunk in the left quarter panel area near the back of the tail lamp and you will see a small black module with a red or white button on top of it.This is the fuel pump inertia switch designed to trip during impact to shut off the fuel pump. Just push down on the button until u feel it click. Then cycle the ignition switch from off to on a couple of times to prime the pump and you should be set to go.

Feb 04, 2009 | 1998 Ford Mustang

2 Answers

My 1994 Mazda b3000 p/u died on me while i was driving. Has gas, new filter, and does crank but wont start. Need help


Does the electric fuel pump come on when you turn the key? It should make a buzzing noise for 3 seconds or so.

Jan 22, 2009 | Mazda B3000 Cars & Trucks

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