Fuel filter resistance

[and0r]

the fuel system, obviously pressurized,
the fuel filter seems to provide resistance to the line

does it come before or after the pressure regulator?

im thinking of a cheap way to get more life out of my fuel pump by eliminating some of the resistance of the filter
what are your thoughts?

 

[ExplorerTom]

The filter is before the regulator.

I’d just install a clean filter instead of trying to re-engineer the fuel system.

Without a filter, any potential debris will go to the injectors where it may pass through or may not.

Replacing a pump isn’t really that hard.

 

[and0r]

The filter is before the regulator.

I’d just install a clean filter instead of trying to re-engineer the fuel system.

Without a filter, any potential debris will go to the injectors where it may pass through or may not.

Replacing a pump isn’t really that hard.

yeah i dont have the tools or the space

 

[1955moose]

You don't have the tools or space for changing a fuel pump? But you have the space to redesign the system. It takes all of 10 minutes and what $7.00 to buy a filter, and slap it on every 40k. You pull the fuel pump relay, start it up till it dies, push in the wacky Ford clamps, new filter done. A bonus, if you hate one of your neighbors, walk the loaded fuel filter over to their garden/lawn, and let her rip! Roses don't grow so well with 89 octane!

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[and0r]

You don't have the tools or space for changing a fuel pump? But you have the space to redesign the system. It takes all of 10 minutes and what $7.00 to buy a filter, and slap it on every 40k. You pull the fuel pump relay, start it up till it dies, push in the wacky Ford clamps, new filter done. A bonus, if you hate one of your neighbors, walk the loaded fuel filter over to their garden/lawn, and let her rip! Roses don't grow so well with 89 octane!

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no, im not crawling under all that ford steel up on jackstands.
that just seems dumb. but, stupid is as stupid does. rather get creative with ramps or dugouts.

no point in replacing the filter, i know how these old things work.
you make one little change and it turns into many!
putting a new filter will likely increase pressure that never used to be there... she is well aged, and holding together still, with no funny man business touching her insides.
the evap and main fuel lines would likely not withstand the new filter well. i would imagine, something along this pressurized system to be brittle. some plastic/rubber component which would probably fail under the new pressure within 100 or so miles.
idk

 

[and0r]

that pump has to be changed, there is no going around it. most pumps dont like sitting in volatile explosives for 20 YEARS STRAIGHT.
thats right. 2019 is the magic number for her!

 

[stamp11127]

Please explain how a new filter has more resistance than an old filter whose filter media is clogged with trash. Resistance increases as orifice size decreases - Hydraulics 101.

 

[Trainmaster]

This post can't be real.

 

[ExplorerTom]

You don’t have the tools to change the pump? But you can remove the filter, fab up a new piece of fuel line that is the length of the filter, flare the ends so it locks in and install it?

Sounds like you have all the answers. We should probably be asking you all these questions.

Ah crap! I just changed the oil and filter in my 2000 with 247k miles. Probably shouldn’t have done that. All that new oil on such an old engine. I should have created a filter bypass and continued to run the old oil. Stupid me.

 

[uscgmac]

Nothing is going to break, just change the fuel filter and be done with it. You don't want to get dirty then wait until the fuel pump craps out and just have it done by a mechanic. Don't see the issue. I would advise having a AAA tow policy in place while owning a first gen Expedition for piece of mind. My fuel pump went out a couple months ago. I just paid my mechanic to do it as I didn't want to be bothered with it. All perfect now. I own several vehicles (new) but the expy gets used the most.

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[and0r]

Please explain how a new filter has more resistance than an old filter whose filter media is clogged with trash. Resistance increases as orifice size decreases - Hydraulics 101.

the old filter is keeping the pressure at bay because i am assuming its clogged and gummy or something
so changing it might introduce additional pressure, from the new filter, which im assuming would flow free

something within the entire fuel liquid circuit, probably wouldn't like that

 

[ExplorerTom]

Actually a clogged filter is going to place way more strain on the pump than a clean filter. A clogged filter is increasing the pressure at the pump.

 

[1955moose]

Is this guy off his meds? Come on guy, don't waste the time of these experienced guys and girls with rhetoric. Most of here have over 40 years experience working on cars/trucks. Believe us or not, but you don't have the facts, we do. We've been doing this crap a long time, and know what's right, and what's wrong. Not putting your vehicle on strong jack stands? I'll trust my heavy duty Hein Werner stands under the frame, before any rickity drive up ramps. I'm still here and walking fine at 64.

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[stamp11127]

and0r there is only one other thing we can do.....
And that is quote Foghorn Leghorn...

“You’re way off, I say you’re way off this time son!”

“This boy’s more mixed up than a feather in a whirlwind”

 

[1955moose]

That boys busier than a centipede in a toe counting contest!

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[and0r]

Putting resistance on the pump likely makes negligible difference. And by likely I mean it actually does not make a difference

Actually a clogged filter is going to place way more strain on the pump than a clean filter. A clogged filter is increasing the pressure at the pump.

uh, no actually
thats not how it works

the amount of strain from this is negligible

 

[ExplorerTom]

Putting resistance on the pump likely makes negligible difference. And by likely I mean it actually does not make a difference

the amount of strain from this is negligible

Buddy of mine never changed the air filter in the furnace in his house. After a few years (bought it new), the fan went out. I’ve owned houses longer than he has and have kept my filter clean and changed- never had the fan go out.

A clogged air filter in an engine will make it less efficient. The engine is nothing more than an air pump. A severly clogged air filter can actually get sucked into the engine until the point at which it pulls it away from the seals creating a path of lower resistance for the air.

But I suppose you’re right: a fuel filter has ZERO effect on the fuel pump- even though that flies in the very face of a comment in your opening post of this thread.

I hope you’re in politics. If not, you are wasting a talent. This level of double speak is amazing. I’m in awe right now.

 

[Plati]

Pressure is a funny thing. If I partially mostly close down the main valve of the water coming into my house … I still build up the same pressure at the faucets (same as the output of the pressure regulator, which is after main valve) if there is no water flowing. Flow rate is greatly reduced though, for a case when the faucet is opened. Not sure what happens to pressure when faucet is open, I think its reduced. If the faucet is partially open I think it maintains pressure at some equilibrium point.

 

[1955moose]

Fuel pump pressure will be reduced measuring at the fuel rail with a clogged filter. The pump is designed to pump just so much, the regulator like your alternator See's to that. One of the main reasons I, and so many here tell you guys that are having driveability issues to check fuel pump pressure. If you suspect a filter, you can actually check it before filter by cranking. As complex as newer cars get, it all boils down to the four things my high school auto shop teacher said. Besides fuel and spark, you need a sound motor. Or as he put it the four strokes, suck, squeeze, bank, and blow!

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[jimz]

A clogged fuel filter will give flakey actions. For instance my 08, 5.4, would run fine at low RPM since small fuel amount needed for motor. Try to speed and low fuel flow caused ruff motor spiting and sputtering, poor transmission shifting. All because the fuel flow starved the motor. I do not know all the sensors that might be involved but I would bet Ford designed the fuel system to have a constant, and set, acceptable pressure. When this fuel system sets for awhile and fuel volume bleeds through the clogged filter the motor runs fine, until accelerated past the fuel flow available.

If the fuel filter found enuff gunk to be clogged and removing the filter will make the rest of the fuel system become the new fuel filter. Then the gunk stopped by the filter will be stopped by plugs and inside motor parts. Makes sense to throw away the fuel filter now because it is clogged and then throw the motor away later because it is clogged/damaged.

But then I have never stayed at a Holiday Inn.