greasefingers
New member
iFORCE said:
We measure beer by the yard, at my house :beer:
Last edited:
24.5 gal. Gas Tank
- Thread starter Koz
- Start date
We measure beer by the yard, at my house :beer:
jeober
New member
Kinda long winded here:
1) All tanks are designed to have unindicated reserve. These means at zero guage reading the tank still has some fuel. This is principally because of tolerances in the tank and fuel sender, and the OEM doesn't want a pissed off customer (and actually some potential liability here).
On the otherside is a thing known as unusable capacity. This is when the useful volume of the tank isn't indicated properly. More times than not it seems one can never achieve rated tank capacity filling from zero gauge indication. This results from tolerances and the fact that the OEM would rather have this condition than the former (where someone runs out of gas with gas indicated).
2) All tanks require an vapor dome above the full fuel level. This is primarily to accomodate temperature variations and the fact the gas in the tank must remain vented (to the carbon cannister) though roll over valves. Typically a vapor dome of 10% is used. All portions of the vapor dome must remain vented over the range of vehicle grades [30%] in all directions.
3) Vehicles today all have Onboard Refueling Vapor Recover [ORVR] systems. These use a liquid seal filler pipe technology where vapors created during fill are forced through and adsorbed the carbon cansiter. Fillers pipes today are about 1" in diameter and there is no longer a vent pipe coming back up along the fill pipe to the filler neck to spit out the shut off signal. [Some pipes may use a very small tubing to the filler neck (1/4"] but this is for another purpose.]
4) One can stuff the vapor dome of item 2 by slowly filling the tank after shut off. This is undesirable to overfill the tank. The EPA also doesn't want the spitback from overfill so signs at the pump now say to stop after the first shut-off. [Most OEMs assume and test using 3 shut-offs.]
5) Fill nozzles use a port on the end, look for a hole in the barrel just before the end, that constantly entrains air during fill. Inside the nozzle is also a venturi device to create a vacuum to suck air through the hole. If liquid touches this hole, air stops entraining and pressure drops thru the venturi system. A diapraghm in the nozzle is sensitive to this vacuum and will actuate the release of the handle input.
6) If one can repeatedly get more than rated capacity without resorting to overstuffing, then the tank shape might be distorted.
7) One more thing: Fuel pumps pump gas internally through the pump for cooling. One will not burn a pump out unless the pump runs completely dry for a period of time. Even normal cranking on a completely empty tank will be OK. The pump does not have to be surrounded by gas. Even so, most fuel pumps are enclosed in reservoirs designed so that the last pumpable quart of fuel of the tank is in the reservoir and around the pump.
1) All tanks are designed to have unindicated reserve. These means at zero guage reading the tank still has some fuel. This is principally because of tolerances in the tank and fuel sender, and the OEM doesn't want a pissed off customer (and actually some potential liability here).
On the otherside is a thing known as unusable capacity. This is when the useful volume of the tank isn't indicated properly. More times than not it seems one can never achieve rated tank capacity filling from zero gauge indication. This results from tolerances and the fact that the OEM would rather have this condition than the former (where someone runs out of gas with gas indicated).
2) All tanks require an vapor dome above the full fuel level. This is primarily to accomodate temperature variations and the fact the gas in the tank must remain vented (to the carbon cannister) though roll over valves. Typically a vapor dome of 10% is used. All portions of the vapor dome must remain vented over the range of vehicle grades [30%] in all directions.
3) Vehicles today all have Onboard Refueling Vapor Recover [ORVR] systems. These use a liquid seal filler pipe technology where vapors created during fill are forced through and adsorbed the carbon cansiter. Fillers pipes today are about 1" in diameter and there is no longer a vent pipe coming back up along the fill pipe to the filler neck to spit out the shut off signal. [Some pipes may use a very small tubing to the filler neck (1/4"] but this is for another purpose.]
4) One can stuff the vapor dome of item 2 by slowly filling the tank after shut off. This is undesirable to overfill the tank. The EPA also doesn't want the spitback from overfill so signs at the pump now say to stop after the first shut-off. [Most OEMs assume and test using 3 shut-offs.]
5) Fill nozzles use a port on the end, look for a hole in the barrel just before the end, that constantly entrains air during fill. Inside the nozzle is also a venturi device to create a vacuum to suck air through the hole. If liquid touches this hole, air stops entraining and pressure drops thru the venturi system. A diapraghm in the nozzle is sensitive to this vacuum and will actuate the release of the handle input.
6) If one can repeatedly get more than rated capacity without resorting to overstuffing, then the tank shape might be distorted.
7) One more thing: Fuel pumps pump gas internally through the pump for cooling. One will not burn a pump out unless the pump runs completely dry for a period of time. Even normal cranking on a completely empty tank will be OK. The pump does not have to be surrounded by gas. Even so, most fuel pumps are enclosed in reservoirs designed so that the last pumpable quart of fuel of the tank is in the reservoir and around the pump.
There is a adjustment(that is not supposed
to be tampered with) inside the gas pump
that sets the calibration.
Some stations either have a switch to
bypass the adjuster or just reset it after
the inspector recalibrates it.
One time I put 26 gallons in a 24 gallon
tank(in SO. CA), not hardly. I doubt you
could get within 1/2 gallon of the rated
capacity even if you were running on
fumes. Anything more and you got
cheated at the pump.
Cliff s
to be tampered with) inside the gas pump
that sets the calibration.
Some stations either have a switch to
bypass the adjuster or just reset it after
the inspector recalibrates it.
One time I put 26 gallons in a 24 gallon
tank(in SO. CA), not hardly. I doubt you
could get within 1/2 gallon of the rated
capacity even if you were running on
fumes. Anything more and you got
cheated at the pump.
Cliff s
MDT4RNR
New member
Gas Gage
Does anyone here know what the estimated amount of gas is at each level marked on the Gas Gage in the instrument panel?
My first guess is to divide 23 into 4= 5.75
My observations might be wrong, but it does not seem to be correct, because when the tank is full seems like one reaches the
Does anyone here know what the estimated amount of gas is at each level marked on the Gas Gage in the instrument panel?
My first guess is to divide 23 into 4= 5.75
My observations might be wrong, but it does not seem to be correct, because when the tank is full seems like one reaches the
I get paraniod when I see the low gas light on the dash.
Has anyone seen the episode of Top Gear where the host drives an audi A8 Diesel from london to scottland and back on one tank? 800 miles none the less!!!
I couldn't believe it when I saw it.
The audi factory said it couldnt be done according to the fuel consumption, length and fuel tank capacity. (it would be a few miles short)
The only explaination for the successful trip was due to the extra fuel in the filler neck.
Oh, and by the way, going down to 0 means your churning all the gunk at the botom of the tank and putting it in the filter.
Has anyone seen the episode of Top Gear where the host drives an audi A8 Diesel from london to scottland and back on one tank? 800 miles none the less!!!
I couldn't believe it when I saw it.
The audi factory said it couldnt be done according to the fuel consumption, length and fuel tank capacity. (it would be a few miles short)
The only explaination for the successful trip was due to the extra fuel in the filler neck.
Oh, and by the way, going down to 0 means your churning all the gunk at the botom of the tank and putting it in the filter.
Top Gear Video of Audi going 800 miles on one tank
WHoa, I was going to do a search on Top Gear Audi at video.google.com, but it was already there when I got to the site. Someone at work must be watching over me.
WHoa, I was going to do a search on Top Gear Audi at video.google.com, but it was already there when I got to the site. Someone at work must be watching over me.
loner
New member
Re: Gas Gage
Dax, I would agree with your conclusion. My experience with Toyotas is that those hash marks are there for visual reference only, and do not correspond to any actual quantity (1/4 tank, 5 gallons, or whatever). The gauge seems horribly nonlinear, plus there is a significant amount of needle movement above and below the upper and lower hash marks.
MDT4RNR said:
Dax, I would agree with your conclusion. My experience with Toyotas is that those hash marks are there for visual reference only, and do not correspond to any actual quantity (1/4 tank, 5 gallons, or whatever). The gauge seems horribly nonlinear, plus there is a significant amount of needle movement above and below the upper and lower hash marks.
MDT4RNR
New member
My MPG
Both of you seem to be getting better milage than I am,
I did my math and I am getting an average of 16.60 MPG. It most be the fact that within the 5 miles I drive to work (each way) there are 12 stop lights (no highway driving at all).
I am taking my truck in today for it's 50000 mile check up.
Later
RickyCRX said:
Both of you seem to be getting better milage than I am,
I did my math and I am getting an average of 16.60 MPG. It most be the fact that within the 5 miles I drive to work (each way) there are 12 stop lights (no highway driving at all).
I am taking my truck in today for it's 50000 mile check up.
Later
05ToyRunner
New member
Koz,
I suggest you go with the spare gas can mod for Christmas!!!! lol
Steve
I suggest you go with the spare gas can mod for Christmas!!!! lol
Steve
