Just the other day, I decided to replace the fuel filter as it was due according to the maintenance schedule for my 1993 Honda Civic DX.
I followed the service manual procedure to disconnect the negative battery terminal and release the fuel pressure by opening the fuel filler cap. The bolts were stuck fairly tight and there wasn't a good place to get leverage. I had to use a bit of PB Blaster to soak the threads, hoping to loosen the bolts. Eventually I was able to loosen everything and put it back together with a new replacement filter.
Btw, I poured the fuel that was in the old filter into the new one before installing it (so I didn't waste the fuel or just let it evaporate into the air). I made sure to pour it through the opening that attached to the fuel rail, not the other opening (from the fuel tank).
After I installed everything and closed the fuel cap, I started the car. Car started fine and sounded normal. It was only after the car started to warm up enough to stop the "fast idle" when I noticed a strange sound that I have never heard from my car (I've had this car for almost 6 years).
It's hard to describe but it's almost like a muffled, mini diesel engine sound. It's only really audible inside the cabin. It seems to be coming from somewhere near the firewall, close to where the fuel filter is. I tried listening to the engine with the hood open but I could only hear the usual noises of the crank/pistons/etc.
I felt for any vibration that would lead me to the source of the sound and found that the hose (see attached picture) leading to the fuel rail pulsated in sync (at least in frequency) with the noise I heard from inside the cabin.
Is something clogged or is anything constricted?
Thanks for any help you can provide.
I have a recording of the noise at http://jbum.tripod.com/noise.mp3
Sunday, August 14th, 2011 AT 9:33 AM