| [ Total Views: 738 | Total Replies: 12 | Thread Id: 94619 ] |
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 chefjones
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| posted on January 5th, 2012 at 07:09 PM |
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Driving me mad !!!
Hi guys, first post, thanks in advance. This is seriously driving me mad. 73 Beetle runs well until on the freeway at 90/110 km, after about 10 mins
will start to run rough, lose power and stop.Have replaced points,plugs,leads,condenser,dizzie and rotor. Carb off (several times) cleaned and
reset,blew out fuel ilne ect.Someone suggested carb icing and I found rusted out riser so replaced that with ill fitting Brazilian rubbish. It ran
well for about 200km on our backroads but on NYE, back on the freeway and same same aarrgh. Any ideas ? Dual port 1600 is in good condition, has pod
style air filter. |
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beetleboyjeff
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| posted on January 5th, 2012 at 07:14 PM |
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Dodgy fuel pump?
From your ole' mate Jeff
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HappyDaze
A.k.a.: Greg Mackie
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| posted on January 5th, 2012 at 07:23 PM |
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Many years ago, I had an almost identical problem with my 1961 Beetle. After going through similar dramas to yours, I finally found the
problem......the 'curly' hose from the fuel tap to the steel fuel line had a kink in it, and was restricting the fuel flow. All it needed was a
twist, and problem solved. Hope yours is that easily fixed.
I'd rather wear a Beetle out by racing it than by polishing it!
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chefjones
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| posted on January 5th, 2012 at 07:28 PM |
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Thanks Greg, yep replaced all fuel hose too |
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pod
A.k.a.: paul mrvw061
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| posted on January 5th, 2012 at 07:37 PM |
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not blocked in the tank end ,just sounds like its running out of fuel
or like Jeff suggested dodgy fuel pump
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chefjones
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| posted on January 5th, 2012 at 07:43 PM |
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Starting to think about the fuel pump again, anyway to test em apart from turning the engine over and watch it spray everywhere? |
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OZ Towdster
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| posted on January 5th, 2012 at 08:19 PM |
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Also check the fuel tank breather hose , as if this is blocked then it will only get worse on a long trip when it doesn't get a brake for the fuel
tank to go back to a neutral pressure instead of the possible negative pressure it is becomming with a blocked breather hose which once the negative
pressure gets to great the pump can't draw the fuel
Don't let body work get in the way of real suspension travel
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 matberry
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| posted on January 5th, 2012 at 08:44 PM |
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Fuel pump pressure and flow rate spec in a good manual.
Also fuel pump pushrod length and my favorite, foreign matter behind the needle and seat, remove it from the carb lid to check all is clean behind the
brass body of the needle/seat.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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beetleboyjeff
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| posted on January 5th, 2012 at 09:13 PM |
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| Quote: | Originally
posted by OZ Towdster
Also check the fuel tank breather hose , as if this is blocked then it will only get worse on a long trip when it doesn't get a brake for the fuel
tank to go back to a neutral pressure instead of the possible negative pressure it is becomming with a blocked breather hose which once the negative
pressure gets to great the pump can't draw the fuel
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You could go for a drive with the fuel cap loose to check this one.
From your ole' mate Jeff
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greedy53
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| posted on January 5th, 2012 at 09:53 PM |
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it could be a coil if its dodgey what you describe would happen after a small drive than over heat and stop when its cooleds down away ya go until
etc.etc.
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modnrod
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| posted on January 6th, 2012 at 06:16 AM |
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Coil is possible, and another thing that gives very similar symptoms is the ballast resistor (if you're running one).
If you meter the ballast, it will look fine, but after a few minutes running, the resistive filament gets hot and opens up (open cct), simulating a
really uncool rev-limiter. When you stop the car to look, it's cooled off and connected again.
If you have a ballast and it has the slightest rattle, replace it.
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Bizarre
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| posted on January 6th, 2012 at 06:36 AM |
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| Quote: | Originally
posted by beetleboyjeff
| Quote: | Originally
posted by OZ Towdster
Also check the fuel tank breather hose , as if this is blocked then it will only get worse on a long trip when it doesn't get a brake for the fuel
tank to go back to a neutral pressure instead of the possible negative pressure it is becomming with a blocked breather hose which once the negative
pressure gets to great the pump can't draw the fuel
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You could go for a drive with the fuel cap loose to check this one.
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Or when you take it off there should be a real rush of air noise
Futue te ipsum!!!
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chefjones
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| posted on January 6th, 2012 at 07:07 PM |
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Thanks for your ideas people, looks like another weekend in the garage with a brew and a bit of good music, could be worse. |
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