A fuel filter is changed every Inspection II. If you don't ever change your fuel filter then bad stuff will make it's way into your engine, or it will clog and starve your engine of fuel. Then you'll pay $4000 diagnosing why your engine blew up when it is really just a clogged fuel filter for $20.How do you know when to change this? And what are the drawbacks if I dont do this?
jonnyIm sure you can go to your nearest auto parts store and find the right size. I did this yesterday hoses looked fine so I just used 3 new clamps. Hardest part was taking the off the hoses from the old filter and probably leaked a 1/4 of a liter of gasoline.
Tip: Before you remove the old fuel filter you may want to mark on the new filter F for front R for rear and B for bottom (or mark an arrow or I for inside)to avoid possibly installing it the wrong way.
5 VACUUM HOSE BLACK 3,3X1,75 part # 51731257971 (per pelicanparts.com)
I bought the clamps from Tischer bmw which are both I believe. There are rubber hoses on both sides 3 are the same size.jonny
Did you use regular screwdriver type clamps? Were you able to clamp down the lines? I have bought some of those red $3 clamps and I am thinking of maybe using them. Are there rubber hoses on both sides of the filter?
I believe I did read somewhere that the older 46 models (mine is 98 production) only have one hose in and one hose out. Anybody care to confirm that?
Great tips. That is exactly what I did too! I ended up having to cut my connecting fuel hoses because they just would not come off the fuel lines. Put new connecting hoses on, lubed inside with some oil and they slipped right onto the fuel lines.Just finished with this and thought I'd chip in with a couple more tid bits.
You can see that there are two hoses on the "in" side. One is labeled "in" and the other "rtn". The blue line should go in the "rtn" and the black in the "in". I don't think you can hook it up the other way very easily and still attach the "out" side hoses but just in case...
Also, if you want to stop the leaking (in my case, the rtn line leaked like crazy) just use the caps that came with you new filter. They fit right over the line (with the hose removed) and occlude it nicely.
Lastly, if you want to replace the hoses it looks like you have to buy a length of hose and cut the three segments to match. I took mine off and cleaned them with gas. No obvious signs of wear so I just reused mine. I'm going to replace them with the next filter change in about 30K miles.
I just replaced my fuel filter, and had some more tips.
I depressurized the fuel system by pulling fuse 54 and running and revving the car until it died. This resulted in very little fuel spillage, what was spilled was just what was in the old filter. As I emptied the old filter, all the gas had black stuff in it, along with small particulate matter, like sand. The hose clamps are a bit difficult to close when they are covered in fuel, but you must use a pair of pliers. After everything was buttoned up, I let the car sit with the key in position 2 for a few seconds to build up the fuel pressure, but I still had to crank it twice. My service engine soon light was on, and the engine was running very roughly and had a significant loss of power. After driving around for about five min., everything was fine. The light went out and the engine was running smoother than before. Also, it seemed as if the engine was a bit peppier than before as a result of the new filter. I have just over 65K miles, so anyone in that mileage might want to replace theirs as well.