Question about 1981 Ford F 100

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Sound from under the hood

When I turn the ignition to the on position, I hear a loud continuious clicking sound. I have always had it since I brought it new. I was told that they thought it was a electronic fuel pump. What do you think?

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Trace the source of the sound and see if its hooked into the fuel lines as it sure sounds like a pump but it could be your tappets too.If you could find the noise and provide a little more info it would be a more accurate answer

Posted on Oct 09, 2008

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Posted on Jan 02, 2017

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I have a 2005 Pontiac that makes a hissing noise underneath the car. you can turn the car ignition on without fully starting car and it still makes hissing noise then stops.HELP!!!!!


There is a distinct sound that has a hissing component when you first turn on the key. It will last a second or two when the key is turned to the run position. When the engine started the sound will return and continue to produce the noise so long as the engine is running.

A relatively low noise is normal. If you are concerned check other like cars for the loudness level.

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The pressure regulator on the fuel rail can also produce a sound when the fuel pump is running. The regulator is under the hood and any reasonable noise would not be a concern, A clicking sound is also normal throughout the fuel system when the engine is running created by the fuel injectors cycling.

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I had a similar issue on my Nissan sentra years ago. In my case it was the fuel injectors clicking because a diode in the cars computer had failed. It would only stop when I pulled the fuse for the injectors under the hood. You may have a similar issue. On mine it just sounded like a regular clicking under the hood. Very loud with the engine off

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It may be due to the starter solenoid having burnt electrical contacts. If this is the case when it doesn't start all you will hear is a loud click under the hood.

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After windstar is shut off it makes a clicking sound


Depends on what the sound is like. Sometimes the exhaust system makes clicks as the metal cools down.

There should be no Relays clicking once the Ignition is turned off. About all you can do is open the Relay box under the hood and insert a stick on the Relays to hear if one is clicking when the conditions are like you describe.

Just put the other end of the stick to your ear and listen.

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I have 2006 Nissan Altima. The engine will not start or turnover, there is also a clicking sound that is coming from the black wiring box, which is located under the hood by front passenger side...


What size engine ? The clicking you hear is probably the starter relay , provided you hear the click while turning the key to the start position . That black box is the fuse / relay junction box. Testing the starter electrical circuits with a volt meter is the way to find the problem . Voltage drop testing . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model and engine size . Under system click on engine then under subsystem click on starting . Click the search button then the blue link.Does your vehicle have a manual or automatic transmission ? First blue link for a manual transmission ,the second link for a automatic transmission .
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Jul 26, 2017 | 2006 Nissan Altima

1 Answer

Car won't start!!! & ABS Light on


Sounds like carbon build up on the contacts inside the electrical ignition switch which is not the key cylinder. Its located on the lower steering coluum if coluum shift or if you have a floor shift it will be inside the console

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if the relay is clicking its working the fuel pump is the problem!!!

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You can try this==== take a screw driver and tap on the relay switch with the handle while somebody is turning the ignition. This is only a test, not a definate solution. If you haven't already, check the starter solonoid. My opinion, if the ignition was bad, it wouldn't even click at the relay, but without testing it's hard to say.

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1 Answer

Engine will not always start. Battery replaced.


can you hear the start relay under the bonnet clicking when you turn the ignition on?.

if you can...then I suspect your starter motor is dodgy.

Dec 30, 2008 | 2000 Ford Mustang

1 Answer

One more question


Hi again,

Appreciate the "Ask Me". With your indulgence, I would be re-posting this in your original problem/post here.

To my understanding a "loud continuous clicking sound" indicates a relay or solenoid opening and closing, whereas an electric fuel pump would produce a low tone whirring sound. This might be of help, image of a typical factory installed mechanical fuel pump:
e3d12b7.jpg
In the possibility that for some reason your particular model has an electric fuel pump, then it would perhaps look something like this:
f145239.jpg

Jul 25, 2008 | 1981 Ford F 100

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