Author Topic: hard to start after fill up of gas.....  (Read 3981 times)

erickmarciano

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hard to start after fill up of gas.....
« on: May 04, 2011, 21:44:32 »
Hi Guys the cars runs great except when the tank is full.
actually it runs great until I stop for like 10 min than it is hard to start only with full tank. I tried starting it with the gas tank off and still not good.My car a Euro 280sl with the simple fuel susytem with only the little black box on the right rear fender.
Can this be flower pot related?
Thanks
Erick Marciano
1994 E500 W124
1971 280sl
1989 Porsche 930 coupe
1988 e30 m3
2001 ducati mh900
2006 ps1000
1962 Vespa GS160

mdsalemi

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Re: hard to start after fill up of gas.....
« Reply #1 on: May 05, 2011, 11:45:14 »
Just a wild guess, thinking out of the box...

If the tank is full, there is a lot of pressure on the return line in the flower pot...so, if there is any obstruction (say, 40+ years of crud) or a weak pump, this pressure might be inhibiting fuel flow?  Just a guess here.
Michael Salemi
Davidson, North Carolina (Charlotte Area) USA
1969 280SL (USA-Spec)
Signal Red 568G w/Black Leather (Restored)
2023 Ford Maverick Lariat Hybrid "Area 51"
2023 Ford Escape Hybrid
2024 Ford Mustang Mach Ex PEV

amg65ri

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Re: hard to start after fill up of gas.....
« Reply #2 on: May 05, 2011, 12:22:47 »
Just a wild guess, thinking out of the box...

If the tank is full, there is a lot of pressure on the return line in the flower pot...so, if there is any obstruction (say, 40+ years of crud) or a weak pump, this pressure might be inhibiting fuel flow?  Just a guess here.

I was thinking the same thing, also the top vent may be restricted as well. This coupled with a full tank would complicate matters. As for the flower pot, I could not believe how much build up can accumulate in the tank.... it worth a check, however a full tank is a lot of fuel to catch in a pan before you drop the filter.... :) 

71Beige280SL

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Re: hard to start after fill up of gas.....
« Reply #3 on: May 06, 2011, 20:53:54 »
Related question...Is a gas smell common after fill up?
- 1971 280SL Beige/Cognac Leather
- 2024 Mercedes GLE 350
- 2024 AMG C43 Sedan

mdsalemi

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Re: hard to start after fill up of gas.....
« Reply #4 on: May 07, 2011, 14:14:50 »
Where is this gas smell?

You have several vent lines from the tank.  There are clamps and hoses and lines, leading to the canister in the trunk.  If the integrity of any of this isn't 100% you'll smell some gas vapors.
Michael Salemi
Davidson, North Carolina (Charlotte Area) USA
1969 280SL (USA-Spec)
Signal Red 568G w/Black Leather (Restored)
2023 Ford Maverick Lariat Hybrid "Area 51"
2023 Ford Escape Hybrid
2024 Ford Mustang Mach Ex PEV

Larry & Norma

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Re: hard to start after fill up of gas.....
« Reply #5 on: May 07, 2011, 16:15:24 »
I agree with Michael, I replaced all hoses and clamps to the canister and all fuel smells went away. Even though visually all appeared to be ok.
Larry Hall (Gnuface)
2023 Ioniq6
2005 C230
1970 280SL

71Beige280SL

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Re: hard to start after fill up of gas.....
« Reply #6 on: May 09, 2011, 01:54:22 »
I have a slight smell in the trunk when I open the lid. Interesting...I had the tank repaired as part of the restoration. Sounds like hoses and clamps?
- 1971 280SL Beige/Cognac Leather
- 2024 Mercedes GLE 350
- 2024 AMG C43 Sedan