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scottsbugged Samba Member
Joined: May 29, 2009 Posts: 53
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Posted: Tue Aug 19, 2014 5:52 pm Post subject: Won't start when hot |
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I have a 72 super. Starts right up runs great no problem, but when I shut it off won't start back up. I can drive as long as I want if I don't turn off. Cools down starts up first try. Why?? |
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Brian Samba Moderator
Joined: May 28, 2012 Posts: 8340 Location: Oceanside
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Posted: Tue Aug 19, 2014 5:58 pm Post subject: |
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Fairly common. Heat makes things expand, also if the carb is too hot the choke wont close. It's recommend that you hold the accelerator down while hot starting. _________________ Wash your hands
'69 Bug
'68 Baja Truck
'71 Bug
'68 Camper
Only losers litter |
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Eric&Barb Samba Member
Joined: September 19, 2004 Posts: 24732 Location: Olympia Wash Rinse & Repeat
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Posted: Tue Aug 19, 2014 6:09 pm Post subject: |
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How does it not start??
Very slow cranking? No cranking?
When engine is cold it has not as much compression as when warmed up _________________ In Stereo, Where Available! |
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scottsbugged Samba Member
Joined: May 29, 2009 Posts: 53
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Posted: Tue Aug 19, 2014 6:54 pm Post subject: |
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Sounds like normal engine cranking just won't start. I read that this could be a sign of the fuel pump getting bad? |
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GJ780662a Samba Member
Joined: June 06, 2013 Posts: 139 Location: Pleasant Garden, NC
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Posted: Tue Aug 19, 2014 7:12 pm Post subject: |
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Could be vapor lock - your heat exchangers or heat risers can be causing the fuel in the lines to vaporize. When it won't start, try pouring some cool water over the fuel pump. If that's it, temporary fix could be to wrap fuel lines in aluminum foil. Permanent fix would be to rout fuel line further from heat exchangers and risers. |
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Kansas Rob Samba Member
Joined: March 15, 2011 Posts: 45 Location: ICT and Below
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Posted: Tue Aug 19, 2014 7:40 pm Post subject: |
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No spark or no gas.
You should be able to use started fluid or a little gas to prime the carb next time to eliminate the fuel pump or vapor lock option.
Same thing happened to me and I jumped through all of the vapor lock drama.
Turns out it was a weak coil.
They get old and don't work as well when hot. _________________ 1968 Beetle
1969 Westy |
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Eric&Barb Samba Member
Joined: September 19, 2004 Posts: 24732 Location: Olympia Wash Rinse & Repeat
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Posted: Tue Aug 19, 2014 7:54 pm Post subject: |
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Or too much gas due to fuel expansion and dripping down the carb into the engine.
Or weak voltage to the coil during starting.
Or even the carb accelerator nozzle not spraying enough.
Seen the above and much much more.
Would try a full tune up first and check carb for above. Then check voltage _________________ In Stereo, Where Available! |
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Tim Donahoe Samba Member
Joined: December 08, 2012 Posts: 11740 Location: Redding, CA
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Posted: Tue Aug 19, 2014 7:55 pm Post subject: |
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I had an H30/31, coupled with a Bosch 034 SVDA distributor. It would start fine when the engine was cold, but was hell when the engine was warmed up. Flooding seemed to be an issue when hot starting, too.
The fix: I got a Solex 34 PICT 3 off The Samba Classifieds and Volkzbitz re-made it for me.
So, I ended up with the proper carb for the distributor I had, and a car that starts well, no matter what temperature the engine is.
Of course, I start it per The Owner's Manual, according to the temperature.
I also got vapor lock on a 114 degree day, but moved my fuel line off the manifold, using a clothespin (I got a new fuel line, also, but won't install it until I pull my engine this fall).
What exactly are your symptoms? And is there a heavy smell of fuel when you have a no-start hot engine?
Tim |
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brendo907 Samba Member
Joined: September 13, 2013 Posts: 339 Location: North Pole, Alaska
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Posted: Wed Aug 20, 2014 4:27 am Post subject: |
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mines kinda goofy like that, i can cold start just fine, shut it off and go into the gas station for a few mins starts right up but 5-10 mins and it cranks alot. starts but i hate being taht guy in the parking lot cranking for awhile to get it to start. Winter project... |
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jlex Samba Member
Joined: January 23, 2009 Posts: 2902 Location: NW Pennsylvania
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Posted: Wed Aug 20, 2014 5:02 am Post subject: |
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Flooding. Hold the accelerator pedal to the floor while cranking (don't pump it!). This will purge the excess gas from the carb...
Many people have trouble with carb'd cars as they're used to fuel injection. _________________ jlex.
'70 std. "Elsie"
'88 Carrera
Last edited by jlex on Wed Aug 20, 2014 1:47 pm; edited 1 time in total |
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scottsbugged Samba Member
Joined: May 29, 2009 Posts: 53
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Posted: Wed Aug 20, 2014 5:04 am Post subject: |
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Thanks for replies I now have somewhere to start. I'll keep you posted. |
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Samer1275 Samba Member
Joined: July 24, 2011 Posts: 205 Location: Jupiter, FL
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Posted: Wed Aug 20, 2014 6:45 pm Post subject: |
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jlex wrote: |
Flooding. Hold the accelerator pedal to the floor while cranking (don't pump it!). This will purge the excess gas from the carb...
Many people have trouble with carb'd cars as they're used to fuel injection. |
Seems most likely. There was a recent thread on that. What kind of fuel pump do you have? The aftermarket pumps do not have a check valve for when a hot engine shuts down. Personally, I have experienced having to hold throttle when starting the engine even hours after an initial ride. If it hasn't been driven in a week it starts on the first turn. I bought an original VW pump with the valve and rebuilt it. I will see if it makes a difference when I install it. Looking forward to your update regarding your situation. _________________ 1969 Karmann Ghia Coupe |
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[email protected] Samba Member
Joined: December 30, 2002 Posts: 22 Location: California
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Posted: Mon Aug 25, 2014 10:40 pm Post subject: Coil |
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Install a new coil. _________________ 72 Karmann Ghia
71 Westfalia Camper
72 Super Beetle
73 Thing |
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DeathTrap Samba Member
Joined: February 26, 2004 Posts: 1757 Location: Sacramento/Vermont
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Posted: Tue Aug 26, 2014 12:09 am Post subject: |
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These guys got vapor lock of the brain
it's either flooding or starving.
Have you ever owned a carburated car before.
poor compression doesn't help either
these little fuel filters plug at the slightes whim of gasohol released slime
never know it till it changed
using the filter as a sight glass to diagnose is wrong
done a tune up lately?
it's not a honda
hold the pedal about 1/8-1/4 down when starting warm. |
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