 fuel level, gauge versus tank |
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| elsargento |
 Dec 31 2009, 06:39 PM
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#1
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Newbie  Group: Members Posts: 44 Joined: 9-September 06 From: Topanga, California Member No.: 6,802  |
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? (IMG:style_emoticons/default/welder.gif) (IMG:style_emoticons/default/sawzall-smiley.gif)
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| Kirmizi |
Dec 31 2009, 06:46 PM
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#2
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Senior Member Group: Members Posts: 836 Joined: 12-February 06 From: Wyoming, US Member No.: 5,568 Region Association: None |
Is the "low fuel" light lit?
Supposedly the sender can stick, but the light's always correct. Mike |
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| mjl1147 |
Dec 31 2009, 06:50 PM
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#3
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Newbie Group: Members Posts: 25 Joined: 3-August 04 From: Buffalo, NY Member No.: 2,445 Region Association: North East States |
QUOTE(elsargento @ Dec 31 2009, 04:39 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? (IMG:style_emoticons/default/welder.gif) (IMG:style_emoticons/default/sawzall-smiley.gif) I've had the same experence. Believe the light, the gauge can be off. |
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| elsargento |
Dec 31 2009, 07:33 PM
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#4
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Newbie Group: Members Posts: 44 Joined: 9-September 06 From: Topanga, California Member No.: 6,802 |
Well no light for low fuel level. but then the bulb might be burned out. I'll check the bulb manana. (IMG:style_emoticons/default/welder.gif) (IMG:style_emoticons/default/sawzall-smiley.gif)
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| osvolant |
Dec 31 2009, 11:02 PM
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#5
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Newbie Group: Members Posts: 33 Joined: 31-August 09 From: Oak Ridge, TN Member No.: 10,748 Region Association: South East States |
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.
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| swl |
Jan 1 2010, 07:37 AM
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#6
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Senior Member Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada |
constriction in fuel delivery somewhere? Mind you that should get worse under accelleration not better.
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| jonferns |
Jan 1 2010, 09:27 AM
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#7
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Advanced Member Group: Members Posts: 2,081 Joined: 29-March 07 From: New Jersey Member No.: 7,631 Region Association: North East States 
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QUOTE(osvolant @ Jan 1 2010, 12:02 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 (IMG:style_emoticons/default/laugh.gif) |
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| Spoke |
Jan 1 2010, 11:57 AM
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#8
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Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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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. |
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| underthetire |
Jan 1 2010, 12:39 PM
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#9
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Only asking, but are the return line and supply line reversed?
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| orange914 |
Jan 1 2010, 09:16 PM
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#10
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
QUOTE(sendjonathanmail @ Jan 1 2010, 07:27 AM) QUOTE(osvolant @ Jan 1 2010, 12:02 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 (IMG:style_emoticons/default/laugh.gif) my old 57 bus just had a "reserve" lever for when it ran out... and this was o.e. (IMG:style_emoticons/default/sad.gif) mike |
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