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Ford f350 w/ 351w no start. Has spark and fuel but you can hear the relays clicking and the coil hums.

I have an intermittant that turned into a no start. It has spark and fuel pressure. When I turn the key on the fuel pump cycles and you can hear the relay click off but the fuel pump keeps going. I replaced the ICM but still the same thing. I can hear a relay clicking open and closed and I can hear the coil hum. When I disconnect the PIP everything quiets down. I also get between 7.50 -9.68 VDC at the coil when it is cranking over.

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  • Cars & Trucks Master
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You don't say what year the truck is, but it could be a faulty EEC relay. You would need to trace the coil voltage circuit to find out why you don't have full battery voltage with the key on.

Posted on Jan 10, 2013

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Posted on Jan 02, 2017

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SOURCE: 1993 Acura - intermittent fuel pump operation (no start)

HI...
The common cause of the problem that you related.
Is the FUEL PUMP RELAY " Called MAIN RELAY.
Is located : left side under the dash.
Is a BIG relay gray colour. with a connector of 7 or 8 wires.
I recomend replace the relay.

And letme know if you solve your problem.

I hope this information work on your problem.
Thank you for use fixya.

Posted on Jul 25, 2008

justuscc
  • 360 Answers

SOURCE: car will just turn over

main relay contacts get burned up...... common on the hondas its under the drivers side dash

Posted on Oct 10, 2008

  • 53 Answers

SOURCE: 2002 Accent Fuel Pump problems

I think that the 2002 accents still have a external fuel pump i would change that but to be shue it is a fuel problem remove the fuel line from the fuel rail and cycle the key on and off checking to see that there is no fuel spurting out of the line. New fuel pumps aer extremly quiet

Posted on Oct 18, 2008

  • 3600 Answers

SOURCE: 1996 Toyota T-100 start up problem. Cranks over

Try checking the fuel pump relay see if it's carroded if it is then sand it, normally the fuel pump relay should come on first. also check that you battery terminals are clean. Be sure to test the pump to turn the key to the run postion first listen to see if the pump runs, if it dosen't then you need to fid out why, also have you changed the fuel filter? Just a thought even if the pump runs if the filter is plugged you may have a slow start condtion because of this.

Posted on Aug 11, 2009

  • 68 Answers

SOURCE: 1996 Toyota T-100 starting problem--- when I first

the fuel pump relay should be located in the under hood fuse box just replace the relay with a new one

Posted on Aug 11, 2009

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My 1999 nissan quest van is like its mot getting gas I put new fuel pump spark plugs cleaned fuel injectors it's still not starting


Can you hear the pump hum or buzz when you turn the key to on? It should come on for a couple of seconds to pressurize the fuel system. If you don't hear it, check the fuel pump fuse. If fuse is good, find the fuel pump relay under the hood. Hold a finger lightly on the relay and have someone turn the key to on. You should feel it click on to power the fuel pump. If no click from the relay, you will have to diagnose the fuel pump circuit. The relay should have power from a fuse link or a maxi-fuse that may be out. The computer signals the relay to turn it on.
Now if you do hear the pump, you would want next to check the ignition circuit: check for spark on one or two of the spark plug wires. The ignition is probably good if you see a blue snapping spark. If weak, intermittent, or orange colored spark, the ignition circuit would need diagnosing.

Jul 12, 2013 | Cars & Trucks

1 Answer

Have a 1999 ford explorer sport 4x4, cranks want start. have replaced fuel pump, crank senser and cam senser, checked fuzes, replaced computer. doesnt seem to be firing


When you turn the key on you should beable to hear the fuel pump come on. Other than that you have a fuel pressure test port, looks just like a tire valve stem get a little probe press the valve after cranking fuel should come out strongly and not dribble out. If is doesnt seem to be firing your going to have check the coil pack for spark from the coil pack take one plug wire out and put it in a position that as you crank the vehicle you will be able to see spark jump or even hear give it a 1/4 air gap from its connection. If you dont have spark and your timing chain isnt broken you need to check for power the choice of tool is a test light.or volt meter. If you dont have either test tool we will go by sound when you turn the key on the engine fuse box has relays do you hear them click. That click noise will be fuel pump relay and PCM relay for power inpect those relays for corrode connections you mainly have a power problem and inspect for proper ground a missing ground can also cause the ECM to not fire the coils2_26_2012_7_32_43_am.gif

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Starting problems fuel relay


If you suspect a relay, swap it with another one then turn the key on (dont crank-over) and listen for the pump.
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1 Answer

1989 Ford Probe engine stalls. Will run intermittent and run up to 5k RPM...then die. I hear fuel relay click under dash (replaced w/fuel pump, inertia switch & fuel rail regulator). Wiring? Air hose...


First, the power relay turns on engine computer. Then the engine computer turns on the fuel pump relay which in turn, turns on the fuel pmp for 5 seconds, unless the engine is running. If you have a new pump, check for spark right after it dies next time.

Oct 23, 2011 | 1989 Ford Probe

1 Answer

I was driving out of a parking lot and the engine just quit and now it won't start back up, it just cranks


If it cranks strong then it's probably not the battery/alternator/starter. Check the battery terminals to make sure they're clean. Cars need 3 things to start and run: fuel, spark, and compression. If it's just cranking it might be the fuel filter and/or pump. Could also be a fuel pump or PCM fuse or relay. Check your manual to find the locations of those in your fuse panel or in the fuse box under the hood. When you turn the key to on, before trying to start it, you should be able to hear the relays clicking. If you put a finger on it you should be able to feel it click (you'll need a friend for that). You should also hear the fuel pump pressurize when you turn the key to on before starting. It sounds like a humming sound that lasts about 3 seconds. If the relays don't click, that's probably you're problem. And if they do click and you can't hear the pump, then you'll probably need to replace the fuel pump and filter. If you hear the pump pressurize then you probably have electrical or spark problem. Hope that helps!

Oct 11, 2010 | 1993 Ford Probe

3 Answers

Car dies intermittantly like no fuel or fire - car cools down and restarts


Need to know make and model, but do these tests: Run the car until it dies. Pop hood, pull one plug wire off of a spark plug, place an old but working spark plug in the connector, lay the spark plug on any metal. Have someone crank car. Do you see a spark? If so, then ignition working. Most likely cause of a car that dies with a working ignition system is the fuel pump system.
Pump working? Do this test: With car that just died, turn key off. Turn key on again (not to start, just to "on"). Do you hear the faint hum of the fuel pump? (I'm assuming your car is fuel injected. Carbureted - just check the ignition as above.) If so, then it could be any of the sensors. Run the engine codes. You should find something. If you DON'T hear the pump run for about 5-7 seconds then shut off automatically, then it is either your pump or the pump relay. Get those looked at.

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1 Answer

02 grand am died while driving,thought it ran out of gas, put gas in wont start still.have no fuel pressure but security light isnt on.


First off, you should turn the key on and see if you can hear the pump hum for about three seconds. You may have to take the cap off and have an assistant listen for the hum. If there is no hum, locate the relay. It is under the hood in the fuse block. The bottom of the cover should tell the location of it. Most of the relays are the same so swap out an identical one. Try the key again. DON'T TRY TO START. Just see if there is a hum in the on position. If there is no hum, try striking the center of the gas tank with a rubber mallet. One solid blow is enough. Listen again for the hum. It may start, but your pump is definitely bad. It may not start again. To change the pump, siphon the tank as low as possible. Disconnect the wiring, the filler tube and the two straps holding the tank under the car. A new pump will have the rest of the instructions for the job. Good Luck. If the pump does hum, you don't have a problem there. Check for spark. If you have the quad4 engine, check the coil pack cover for wear. It's like an inverted distributor cap mounted to the bottom of the cover, it is white plastic and can break down with age and mileage. If you have another car, have the coil packs tested. Oh and if you do hear the fuel pump turn on, try replacing the fuel filter before dropping the tank to change the fuel pump. Good luck.

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MY Ford F-150 cranks but will not start. Check engine light flashes. Sometimes the truck will run but runs very rough. I have spark. my EGR solenoid clicks and relays click. I replaced the mall and the...


Are you sure the spark is sufficient? I have seen weak coils cause your problem also bad coil wires loosing to much voltage to the distributor.

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1 Answer

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first do you hear your fuel pump running? if you don't more then likely the relay may have went bad. second check your connection to your coil's..make sure there clean and tight..and getting back to the fuel problem if you hear your pump running then it could be the fuel filter clog...try this and let me know....

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2 Answers

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I agree with Loringh. Also check to see if you can hear the fuel pump come on with the key in the "on" position. You should hear a hum for a few seconds.

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