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Old 12-01-2014
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Fuel Filter change

Hey guys,

Quick question. I need to change the fuel filter in my truck but it is currently not starting. It will turn over and over but not fire (this is one of our guesses as to the problem). How can I relieve the fuel system pressure if it is not cranking?

TIA
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Old 12-01-2014
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Pull off the blue cap on the back of the fuel rail and push the valve. Alot like a tire valve stem. Same thing but on a fuel rail.
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Old 12-01-2014
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On the Fuel Rail, where the fuel injectors are, you will see a schrader valve(looks like a tires air valve), should have a cap on it just like a tire's valve would.
Put a towel over it, your hand, when you press down on the center pin, just like letting the air out of a tire, there can be up to 65psi of pressure, so gas can squirt 30 feet.

Dirty Fuel filter usually wouldn't cause a no start, it would cause limited power at highway speeds at first, because of reduced flow, but engine would start and idle fine.

The fuel pump in the tank should come on for 2 seconds each time the key is turned on, this is to prime the fuel pressure.
If possible listen for this to happen, repeat as many times as you want, you can't "over-pressurize" this system.

And if you want to check if it is even a fuel related no start, put some gas or starting fluid in the intake and crank the starter motor.
If it fires up then dies, fuel is your problem
If it doesn't fire up then spark is the problem.

Or on a 2.5l it could be timing belt broke, engine would usually have a lope to it when cranking starter motor if that was the case, i.e. it would sound funny.
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Old 12-01-2014
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Thanks for the quick response! Is this valve closer towards the tank or towards the engine? Sorry, I've been away from working on my truck for a long time and sunk into the VW world lol
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Old 12-01-2014
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Quote:
Originally Posted by RonD View Post
On the Fuel Rail, where the fuel injectors are, you will see a schrader valve(looks like a tires air valve), should have a cap on it just like a tire's valve would.
Put a towel over it, your hand, when you press down on the center pin, just like letting the air out of a tire, there can be up to 65psi of pressure, so gas can squirt 30 feet.

Dirty Fuel filter usually wouldn't cause a no start, it would cause limited power at highway speeds at first, because of reduced flow.

The fuel pump in the tank should come on for 2 seconds each time the key is turn on, this is to prime the fuel pressure.
If possible listen for this to happen, repeat as many times as you want, you can't "over-pressurize" this system.

And if you want to check if it is even a fuel related no start, put some gas or starting fluid in the intake and crank the starter motor.
If it fires up then dies, fuel is your problem
If it doesn't fire up then spark is the problem.

Or on a 2.5l it could be timing belt broke, engine would usually have a lope to it when cranking starter motor if that was the case.
Hey Ron,

We put some starter fluid in the throttle body (removed air tubing and held gas pedal to get it inside body). On first crank after this it tried to start and almost seemed like it did fire and then shut off immediately. Any ideas?
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Old 12-01-2014
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You have spark and timing belt so reads like a dead fuel pump, not filter, but for $10 filters are always good to change

Can you hear pump come on with the key?
If not then there are a couple of things to check before you have to replace the pump.

In the engine compartment fuse box there is a Fuel Pump Fuse, usually 30amp
And there is a Fuel Pump relay, a black cube, put your finger on it when someone turns on the key, you should feel it click inside then click again after 2 seconds so on then off.

Then there is the inertia switch, it cuts power to the fuel pump in case of an accident.
It is located in the passenger side of the cab near passengers feet.
It can be just under the glove box behind the top of the carpet or behind the kick panel(panel just in front of the door on the side), usually at the top.
It will have a reset button on the top.
Truck has to be bounced pretty good to turn off fuel pump this way, or towed, so longshot but not a no shot

Last edited by RonD; 12-01-2014 at 03:36 PM.
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Old 12-01-2014
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I'll check the fuse/relay and the sound tonight. I'm pretty sure it's making the sound, but not 100% definite.
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Old 12-01-2014
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Ford Fuel pumps are not quiet, I think they are made by the same people than make the power steering pumps, lol.
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Old 12-01-2014
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LOL I know exactly what sound you're talking about, I just cannot recall from this past Saturday that it was doing it. I had my 70 y/o dad helping me and with his jawing and telling me how to crank it I couldn't hear it! :P
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Old 12-01-2014
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Ok, no sound.

Fuse appears to be okay.

Took FP relay and swapped with horn relay. FP continued to not prime and horn continued to work.
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Old 12-02-2014
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Reads like bad Fuel Pump
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Old 12-02-2014
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Quote:
Originally Posted by RonD View Post
Reads like bad Fuel Pump
Do you know the Part # for an OEM replacement? I tried looking at Rock auto, advance and the like and could not find a specific OEM pump only.

Thanks for your help Ron.
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