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  #1  
Old 05-19-2002, 07:32 PM
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Join Date: Feb 2002
Location: Monroeville, NJ
Posts: 93
Unhappy Mystery Fuel Problem ?

Finally got my 1987 560 SL on the road, and need to take it through New Jersey inspection. Have a few problems, however:

1. Car appears to run out of gas (gauge is broken) but, when filled, only takes about 13 gallons.

2. Engine runs rough at idle (intermittment miss) and also under load. Feels like its surging a little.

3. Exhaust seems abnormally hot. I tried to hold a plastic bag up to it to see if I could hear a miss, and it melted the bag immediately! Makes me think it might be running lean (engine water temp is fine).

I'm wondering if this could be as simple as a clogged fuel filter, or involve the dreaded OVP relay. Anybody have any advice?
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M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
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  #2  
Old 05-19-2002, 08:32 PM
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Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Max J. Sandler,

It is hard to say, really, what the problem might be, but I have found some filling stations with relatively high pressure hoses and they can cause the filling procedure to become a challenge. The agitated gas foams a little (nothing compared to Diesel!) and trips the shut off sensor. It also seems to pressurize the air in the tank, and you get air pushing back out as the gas is going in which also makes the little trip device shut off. Have you tried putting the filling nozzle on the lowest flow rate notch and seen how much gas you get to go in?

Seems to me if you are getting expected engine performance (starting, throttle response, mileage) on the 13 gallon load you put in, there is really nothing much else wrong. And exhaust gas temps are higher on cars with active catalytic converters, so melting a plastic bag after it is warmed up is not really alarming.

Hope this helps, Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #3  
Old 05-19-2002, 08:36 PM
Registered User
 
Join Date: Feb 2002
Location: Monroeville, NJ
Posts: 93
Thanks for the quick reply, Jim.

You may be right about the gas pump shutting off due to trapped air. I'll try putting more gas in it at a self-serve gas station (the ones in NJ are all attended). Now all I have to do is figure out the engine miss/surging problem!
__________________
M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
Reply With Quote
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