i am going through right now and checking all my one-way valves. the fuel filter has an arrow pointing in one direction like the valves. is it only supposed to be able to blow one way or is it alright if it blows both ways?

 

huh??

 

Dood, he's from Utah...all I've got to add is - huh??

(They are lucky if they get "blowed" at all...)

OK, here's the REAL answer now that I'm done being an *******: The ARROW is the direction of flow. It flows from Point A to Point B, and NO, it is NOT OK if you reverse it. It is designed to flow in one direction only.
THAT is WHY they put arrows on stuff.

The fuel flows from the tank to the engine. It is very important to change your fuel filter at least every 15K miles, I do mine every 10 to be on the safe side.

Changing the fuel filter on your car should be done only by the dealer, and they will charge you about $300 for it. I say GO FOR IT!

(Note to self, buy Mazda stock tomorrow)

 

Are you sure you are looking at the fuel filter?

 

the fuel filter is under the car above the rear differential

 

filters do often have flow direction arrows

inside the body is a pretty standard paper element filter which is glued to the ext. shell in such a way that it covers 1 opening

if high pressure fuel feeds into the inside of the filter it can blow the paper filter off it's mount on the external shell, this could happen for example if you never changed your filter and it started to block...or if you fitted an uprated fuelpump...

eitherway it would float around inside the shell and stop filtering, causing litle flecks of rust/etc to block your injectors

the fuel flow from the tank needs to enter into the shell, (perhaps being directed onto the alloy end cap of the paper element forcing it to seal better rather than worse)

also any rust/crap/water etc would then sit inside the larger space between the shell and the element rather than the smaller central paper element

eric e

or thats what i figured from cutting open the alloy fuel filters on my bmw bikes anyway

 

The reason I ask is that it doesn't sound like he's under his car...

 

 

That's a lot of money!

 

Shoot, bring me your car, a fuel filter, and $300 and I'll change it for you...

 

If you can't remember what way you took your old fuel filter off to put the new one on then you probally shouldn't be changing your fuel filter in the first place. Another thing that makes changing your fuel filter fun and worth while is to have a dremel with a cutting blade ready for after you get done putting the new fuel filter in. What you do is take the old filter and cut it in half, see how dirty it was int he first place. After you see how dirty it was you take a match and you lite that ***** on fire, it relieves all the stress that you had to go trhough to get it out. As a side note, make sure you don't have a long sleeve shirt on as you may lite your arm on fire as well. I'll never do that again

 

im not talking about the fuel filter under the car. it is under the hood it looks like a one way check valve. i know it's called that because i have the repair manual. it leads to the extension manifold. it's not like the fuel filter under the car. if you don't believe me check the diagram on autosportracetech.

 

if it's a small 1 way check valve with an arrow in the engine bay for air or vacuum then i would say...

yes, sucking and blowing on it should check if it's working ok

my ducati has 1 in the fuel tank breather line so unburnt hydrocarbons aren't vented to the atmosphere

sometimes the little plastic? flapper in them gets gunked up, a little kerosene or wd40 may help to free it up and allow it to pass air in only 1 direction

eric e

 

i believe you are talking about the one way check valve connected to the mas air sensor... it should be pointing down.

 

That's not a check valve, it's a filter as he said.

And that's not a Mass Air Sensor either (MAF), it's a MAP sensor (Manifold Absolute Pressure).


As for the filter, as with any filter it has a filteration direction.

 

It's just a filter, not a check valve so it will blow both ways.

The arrow is for the direction of filteration (like putting in a new filter in your central air unit). It should point towards the MAP sensor.

 

Thanks for correction Mahjik.

 

I think what he is talking about is filter right next to the oil filler. Im pretty sure it's an oil catch can. I could be wrong though.