Suddenly getting more fuel in tank?
06-15-2010, 11:24 AM
#1
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Join Date: Mar 2005
Posts: 116
Suddenly getting more fuel in tank?
97 Z28. I usually let the fuel pump fill up the tank until it autostops which is normally around 14+ gallons (depending on low I've let it get)
Last week the pump stopped and I checked the price which was way more than I normally pay and then checked the gallons to discover that it has pumped 17 gallons in. I thought the gas station might've ripped me off but I've gone to this station for almost 15 years with no problem before so decided to watch it. I actually got another 3 gallons worth of mileage out of the tank before it went empty. So today I went to a different station this time and got almost 16 gallons into the tank before I stopped it manually.
There's no sign of leakage at all and the pump didn't backspill.
(My evap cannister could probably use changing though)
Any ideas?
Last week the pump stopped and I checked the price which was way more than I normally pay and then checked the gallons to discover that it has pumped 17 gallons in. I thought the gas station might've ripped me off but I've gone to this station for almost 15 years with no problem before so decided to watch it. I actually got another 3 gallons worth of mileage out of the tank before it went empty. So today I went to a different station this time and got almost 16 gallons into the tank before I stopped it manually.
There's no sign of leakage at all and the pump didn't backspill.
(My evap cannister could probably use changing though)
Any ideas?
06-22-2010, 01:23 PM
#3
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Join Date: Mar 2005
Posts: 116
Just filled up at a third station and easily got 16 gallons in with the gauge showing an eighth of a tank left. Normally the pump would auto shut off at 14-15 gallons.
So either 3 different companies in 3 different locations in town are all ripping me off, 3 different fuel pumps are breaking in the same way or somethings changed in my fuel system. Again, I don't appear to be leaking fuel and my gas mileage is increasing commiserate with the added gallons.
How do the fuel pumps in the gas stations determine when to shut off an automatic flow to prevent overflow? Is it fume level or pressure?
So either 3 different companies in 3 different locations in town are all ripping me off, 3 different fuel pumps are breaking in the same way or somethings changed in my fuel system. Again, I don't appear to be leaking fuel and my gas mileage is increasing commiserate with the added gallons.
How do the fuel pumps in the gas stations determine when to shut off an automatic flow to prevent overflow? Is it fume level or pressure?
06-23-2010, 11:39 AM
#5
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,648
The pump stops when liquid fuel hits the tip of the nozzle.
Check the bottom of your fuel tank and see if it has buckled outwards.
In the future, I would avoid running the tank down to 1/2 to 1-1/2 gallons remaining. Run the pump dry and there's a good chance you will destroy the pump.
Check the bottom of your fuel tank and see if it has buckled outwards.
In the future, I would avoid running the tank down to 1/2 to 1-1/2 gallons remaining. Run the pump dry and there's a good chance you will destroy the pump.
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