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Old 09-11-2008, 09:46 AM
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Fuel leak and fuel filter change

Hey guys, I have discovered a fuel leak in the supply hose(believe thats what it is called). It's the hose that runs out of the firewall to the primary filter. Mine is a white filter but the replacement one I have is clear. My question is, is there anything special I need to do? Or can I just unscrew the hose and replace it and pop the new filter in without priming the pump or anything else? I only run diesel and at the most B5 if it's available. So I am using a hose I bought from Advance. It's made in the USA and it says 30r6 on it.
The clear filter I bought from Fastlane.

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Old 09-11-2008, 10:11 AM
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While you are at it, you might think about replacing the hose on both ends of the primary filter. If you fuel tank is fairly full, be prepared to plug the supply line once the first connection is broken.
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Old 09-11-2008, 12:16 PM
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Thanks for the tip. I got about a half tank. So I'll be ready. Don't want to loose to much expensive diesel!
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Old 09-11-2008, 12:56 PM
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I just replaced the hose in my 1983 300sd. I bought the replacement hose from dieselgiant.com. You just loosen the clamps, replace the hose and in-line filter, then tighten the clamps again. If you tighten the clamp too hard, I suspect you could crush the metal fuel line, so I just tighten the clamps until they compress the hose a little bit. When you're done replacing the hose and filter, they will have air in them, so you will need to loosen the primer pump handle (the round plastic plunger just to the left of the in-line filter) and then pump it until you see the in-line filter fill up with fuel. Keep pumping until you hear the sound of fuel going back to the tank through the return line. It makes a little squirting noise. Then re-tighten the primer pump and start the car. If your car is like mine, the primer pump will leak a little bit while you're using it, but will stop leaking when you screw the plunger back down.

Gene

1983 300d (133k)
1983 300sd (118k)
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Old 09-11-2008, 02:55 PM
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Quote:
Originally Posted by GeneE View Post
If your car is like mine, the primer pump will leak a little bit while you're using it, but will stop leaking when you screw the plunger back down.

Gene

1983 300d (133k)
1983 300sd (118k)
Most do this, replacing it is not too expensive or difficult.
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Old 09-11-2008, 04:59 PM
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Hey guys, just replaced the filter and fuel hose. All went well I think. The car runs like a champ. However, after I installed the filter and hose I started the car before I primed. Just wanted to see if it would start. Maybe not the best thing but thats what I did. Anyway, it started just fine. I watched the clear filter fill up. But only about half way. It had bubbles in it. It was idling fine though. So I shut it down. Unscrewed the pump and started pumping. Large amounts of diesel would come out the top of it while pumping. Did this 10 or so times until I thought I had wasted enough diesel. Started it up. Filter is almost full with one bubble in it. Just drove it and got on it a lil bit and seems fine. My question is, is the filter suppose to be totally full or does it seem like everything is okay? Thanks for all of your input.
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Old 09-11-2008, 05:06 PM
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Everything sounds OK. It is normal for the in-line filter to have a small amount of air or small air bubbles in it. It is interesting that you could start it without priming. I've never tried that. The engine must have some self-bleeding ability for air that gets into the supply line. Thanks for the follow-up post.

Gene

1983 300d (133k)
1983 300sd (118k)
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Old 09-11-2008, 05:16 PM
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Quote:
Originally Posted by GeneE View Post
Everything sounds OK. It is normal for the in-line filter to have a small amount of air or small air bubbles in it. It is interesting that you could start it without priming. I've never tried that. The engine must have some self-bleeding ability for air that gets into the supply line. Thanks for the follow-up post.

Gene

1983 300d (133k)
1983 300sd (118k)
No problem, thanks for the reply and tips. I also forgot to mention that I removed the gas(diesel) cap before I removed the hose and line. I was thinking maybe that would relieve some pressure and I wouldn't get diesel squirting out everywhere. It seemed to work, not much diesel came out when I removed the hose and filter. I'm glad I got a clear filter now. It's neat to look at the diesel in it. I had a white one before that I think was OEM, had MB symbol on it.
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Old 09-11-2008, 06:54 PM
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Originally Posted by JCSC2 View Post
My question is, is the filter suppose to be totally full or does it seem like everything is okay? Thanks for all of your input.
There is normally a visible bubble in the primary filter, you're OK.
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Old 09-12-2008, 09:36 AM
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Originally Posted by toomany MBZ View Post
There is normally a visible bubble in the primary filter, you're OK.
Thanks again for everyone's input. This forum rules! I can't imagine how much money I have saved fixing things on my car from all the knowledge I have gained from this forum. I drove the car about 40 miles last night and it ran great.
Get this........ my wife was even bragging to one of her girlfriends about this forum and how I have fixed things on my car with the help of this forum and it's members! Really cool!
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1994 Saturn SC2 130,000 miles
2000 Mazda 626 LX V6 (wife's car)
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Old 09-12-2008, 07:49 PM
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Thanks again for everyone's input. This forum rules! I can't imagine how much money I have saved fixing things on my car from all the knowledge I have gained from this forum. I drove the car about 40 miles last night and it ran great.
Get this........ my wife was even bragging to one of her girlfriends about this forum and how I have fixed things on my car with the help of this forum and it's members! Really cool!
LOL, this forum is here to help, glad you were able to fix a few things.
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Old 09-12-2008, 08:10 PM
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Get this........ my wife was even bragging to one of her girlfriends about this forum...
Just don't let your wife brag to your girlfriends.

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