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914World.com _ 914World Garage _ fuel level
Posted by: elsargento Dec 31 2009, 06:39 PM
I might be barking up the wrong tree but for me not uncommon. Seems like when my gauge reads around 1/4 tank I start getting the bucking syndrome. Is it possible the tank is lower than what the gauge reads and the pump is sucking air? I can drive through it with acceleration but when I back off it starts the hucka buck..Does any of this make sense? 
Posted by: Kirmizi Dec 31 2009, 06:46 PM
Is the "low fuel" light lit?
Supposedly the sender can stick, but the light's always correct.
Mike
Posted by: mjl1147 Dec 31 2009, 06:50 PM
I might be barking up the wrong tree but for me not uncommon. Seems like when my gauge reads around 1/4 tank I start getting the bucking syndrome. Is it possible the tank is lower than what the gauge reads and the pump is sucking air? I can drive through it with acceleration but when I back off it starts the hucka buck..Does any of this make sense?
I've had the same experence. Believe the light, the gauge can be off.
Posted by: elsargento Dec 31 2009, 07:33 PM
Well no light for low fuel level. but then the bulb might be burned out. I'll check the bulb manana.
Posted by: osvolant Dec 31 2009, 11:02 PM
Make yourself a dip stick from a piece of wood dowel. Periodically dip your tank and compare those readings to your fuel gauge as you go thru a tank of gas. Can't do this in most cars but it's easy in a 914.
Posted by: swl Jan 1 2010, 07:37 AM
constriction in fuel delivery somewhere? Mind you that should get worse under accelleration not better.
Posted by: sendjonathanmail Jan 1 2010, 09:27 AM
Make yourself a dip stick from a piece of wood dowel. Periodically dip your tank and compare those readings to your fuel gauge as you go thru a tank of gas. Can't do this in most cars but it's easy in a 914.
Yep, just like the early bugs. Its great having to stop periodically on long trips to dip a wooden stick into the tank to see how much fuel you have
Posted by: Spoke Jan 1 2010, 11:57 AM
My 74 2L FI engine did the same thing at low fuel levels. Just slight bucking here and there. I attributed this to air bubbles from the movement of fuel in the fuel tank pickup.
Since fuel is going into the tank from the return fuel line and fuel is being sucked into the fuel line right next to the returned fuel, it would seem that at low fuel levels that the returning fuel could be causing bubbles which are sucked back into the fuel pickup.
Conversely, if the fuel level is low and you do a quick turn and uncover the fuel intake in the tank, air bubbles again are introduced into the fuel system and are injected into the cylinders instead of gas.
My solution to this in my 914 and 911 is to use the 1/2 tank level as the refuel level.
Posted by: underthetire Jan 1 2010, 12:39 PM
Only asking, but are the return line and supply line reversed?
Posted by: orange914 Jan 1 2010, 09:16 PM
Make yourself a dip stick from a piece of wood dowel. Periodically dip your tank and compare those readings to your fuel gauge as you go thru a tank of gas. Can't do this in most cars but it's easy in a 914.
Yep, just like the early bugs. Its great having to stop periodically on long trips to dip a wooden stick into the tank to see how much fuel you have
my old 57 bus just had a "reserve" lever for when it ran out... and this was o.e.
mike
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