I've purchased my 1986 diesel late '09 and only had a problem with an exhaust leak and sway bar. I was able to get accustomed to the fumes going in the cabin and dealt with my sway bar by welding it, but for a few weeks now I have a fuel leak. It's getting bad.

A little while ago, I filled up all the way. I noticed that I had a bit of fuel on the snow under my car, it wasn't bad so I dismissed it as maybe I spilled a bit and it later dripped down. After what seems to maybe have been a month, it got a hell of a lot worse.

So, today I drove the car up on blocks and slid under there. Sure enough, I found a wet spot at the rear-driver's side. There's a mount for brake lines, that's where the fuel accumulates and drips from. I can't distinguish where the tank is, I know that it's behind the back rest of the rear seat, but I can't pinpoint any opening from below except for a rubber cork, which I didn't remove. I didn't see much tubing there either besides the green brake lines.

I have a lot of experience working on semi trucks as my father has owned a variety of rigs and I've grown up working on them weekly, but cars are a completely different story for me.

Has anybody else had the same issue with their fuel system?

Check the bushings around the hard fuel lines and see if the hard line is good..just a thought..


I think you access the tank thru the trunk..
follow the hard fuel lines back to the tank, there are some soft hoses that connect to the tank, maybe those are the little demons..

I am no mechanic and still learning too..so the pro's will chime in soon!

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At quick glance I didn't see any fuel lines there, unless I had mistaken them for brake lines. Where would they generally be located for when I look there again?

The hard lines (supply and return) run from the left side of the engine, visible underneath the car, to back near the differential. There each line has a short section of rubber (5/16" 8mm id) transitioning to the tank.

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

None of that seems to be leaking, the fuel is accumulating in one spot. I've quite surely given up at this point. Is there an additive that I can perhaps purchase that might clog the leak without damaging my fuel system?