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-   -   Does dirty fuel filter cause bad economy? (https://ecomodder.com/forum/showthread.php/does-dirty-fuel-filter-cause-bad-economy-12017.html)

Z2TT 01-25-2010 08:46 AM

Does dirty fuel filter cause bad economy?
 
Hello.

I have read on various forums that people have experienced better fuel economy after changing their fuel filters.

I'm wondering, how can a dirty fuel filter cause the vehicle to use more fuel?
wouldn't it use less?

Thanks.

MadisonMPG 01-25-2010 08:48 AM

It can cause you to have worse, but most of the time it doesn't. (at least in my case)

Z2TT 01-25-2010 09:04 AM

Thanks,

I'm wondering though, what is the technical explanation behind it causing bad fuel economy.

Johnny Mullet 01-25-2010 09:39 AM

If the filter is clogged, it won't run. If it's restricted, it simply makes the pump work harder.

Peter7307 01-25-2010 04:19 PM

Quote:

Originally Posted by Z2TT (Post 156529)
Hello.

I have read on various forums that people have experienced better fuel economy after changing their fuel filters.

I'm wondering, how can a dirty fuel filter cause the vehicle to use more fuel?
wouldn't it use less?

Thanks.

Z2TT,
A dirty fuel filter makes no difference to economy but it usually restricts the upper rev limit simply due to lack of flow.

Totally blocked the filter simply stops the engine since fuel can't get through.

Pete.

Dave's Civic Duty 01-25-2010 04:35 PM

By trying to keep the engine running, the natural impulse is to add more throttle. So to make up for the restriction we try to add more fuel by pumping the accel pedal. So for instance instead of having the engine cruise at let's say 1500 RPM we overcompensate & the result is a fluctuation in overall engine speed 1250 to 1750 to 1400 to 1600, just trying to keep a steady 1500.

Dave

Frank Lee 01-25-2010 05:18 PM

If only K&N made fuel filters- think of the power and economy!!! :eek:

Gasoline Fumes 01-26-2010 08:18 AM

I thought the dirty air filter thing was from back when cars were carbureted. Doesn't a restriction in airflow act as a choke, making the engine run rich?

Dave's Civic Duty 01-26-2010 08:48 AM

Frank Lee, what is your reasoning behind the K&N fuel filter. I run a K&N air for my truck, I noticed a difference right away. Is it an ultra low restriction gas filter?

Dave

gone-ot 01-26-2010 09:10 AM

Quote:

Originally Posted by Frank Lee (Post 156680)
If only K&N made fuel filters- think of the power and economy!!! :eek:

...DANGER, Will Robinson, DANGER!

...if you use both a K&N air filter and a K&N gas filter, you'll save so much gasoline that it will backup and overflow the gas tank capacity, causing hydrocarbon air pollution and a fire danger (wink,wink)!!!


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