[cris90]

Isn't the fuel pump relay in the engine bay?

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[PoManzAWD]

Yep, relay is in the fuse/power box under the hood. Why?

 

['05Train]

The relay's under the hood, the pump is in the tank, well above the fuel pickup. If you look at a photo of the fuel pump assembly, you'd need to refuel at about half a tank in order to keep the pump completely submerged. Which would of course be ridiculous. Look in the manual. Does it say anything about refueling at half a tank? No, it doesn't. And Subaru has a pretty sharp staff of lawyers who would demand some sort of disclaimer or warning if there was an issue using up 15 gallons of gas in their 16 gallon tank. Other car companies too.

The "cooling the fuel pump" myth is bunk, as there are plenty of pumps in your house that work just fine not being submerged (dishwasher, washing machine, etc).

Running the tank (and ergo the pump) dry will absolutely damage it if you make a habit of it. But if you're constantly running out of gas you probably have larger issues.

 

[PoManzAWD]

The "cooling the fuel pump" myth is bunk, as there are plenty of pumps in your house that work just fine not being submerged (dishwasher, washing machine, etc).

Running the tank (and ergo the pump) dry will absolutely damage it if you make a habit of it. But if you're constantly running out of gas you probably have larger issues.

Comparing a dishwasher pump with a fuel pump? Totally different pump/motor design, speeds, pressures and flow rates. The only cooling they get is from the fuel. They don't need to be completely submerged for this to happen (bad wording on my part above).

There's no way to run your tank "dry", the pump will loose prime and stop pumping before that happens.

 

['05Train]

Comparing a dishwasher pump with a fuel pump? Totally different pump/motor design, speeds, pressures and flow rates. The only cooling they get is from the fuel. They don't need to be completely submerged for this to happen (bad wording on my part above).

There's no way to run your tank "dry", the pump will loose prime and stop pumping before that happens.

You are welcome to believe that. Again, please point out where in the manual it says you can't use the full capacity of the tank.

 

[Maxxy]

I ran mine so low last week that the amount of klm to go disappeared. I got home after a night shift and asked my wife to fill up the jerry can (5litres). I went to the petrol station and put in a further 55litres. I won't be doing that again in a hurry.

 

[MAINIAC XV]

I do not see the purpose of running the tank to empty. I can see running the tank till the low fuel warning light comes on and then filing up to see what your gas tank has left as a reference. You do not need to run your tank dry to check your mpg. Subaru says it` a 15.9 gallon tank, why would they lie about that. Theoretically you could probably get 15.5 gallons to be sucked up but why. Over the years the bottom of your tank will collect contaminates and moisture, why would you want to run that through your engine ?

 

['05Train]

I do not see the purpose of running the tank to empty. I can see running the tank till the low fuel warning light comes on and then filing up to see what your gas tank has left as a reference. You do not need to run your tank dry to check your mpg. Subaru says it` a 15.9 gallon tank, why would they lie about that. Theoretically you could probably get 15.5 gallons to be sucked up but why. Over the years the bottom of your tank will collect contaminates and moisture, why would you want to run that through your engine ?

One of the things I like about the car is that it's got an adult-sized gas tank. Other cars I looked at made do with aaround 12 gallons. I drive between 600-800 miles a week, so that makes for fewer fuel stops. May not be a big deal to some, but it is to me. Oh, and there's usually a $.30/gallon difference in the price of fuel between my home and my office. Nedless to say, I don't fill up at home unless I absolutely have to.

Crud can and does develop in the tank; either from dirty fuel or from the tank lining degrading. In either case, the screen over the pickup will prevent it from being sucked into the fuel system and the fuel filter will prevent it from ever seeing the engine.

 

[peytonracer4]

One of the things I like about the car is that it's got an adult-sized gas tank. Other cars I looked at made do with aaround 12 gallons. I drive between 600-800 miles a week, so that makes for fewer fuel stops. May not be a big deal to some, but it is to me. Oh, and there's usually a $.30/gallon difference in the price of fuel between my home and my office. Nedless to say, I don't fill up at home unless I absolutely have to.

Crud can and does develop in the tank; either from dirty fuel or from the tank lining degrading. In either case, the screen over the pickup will prevent it from being sucked into the fuel system and the fuel filter will prevent it from ever seeing the engine.

Lol @ adult size fuel tank. 16 gal is the norm for most cars today. 24 is the norm for trucks or larger SUVs.
It all depends on the car and it's gas mileage. They design tanks to carry the car about 500 highway miles. So cars that get great mileage have smaller tanks and cars that get worse mileage (trucks and SUVs) have larger tanks.
We uses to have a suburban with a 42 gallon stock tank. That was insane. Imagine a tank that large on something that actually gets decent gas mileage. You could travel anywhere on one tank.




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[PoManzAWD]

You are welcome to believe that. Again, please point out where in the manual it says you can't use the full capacity of the tank.

In the manual? Who said that?

Likewise on the believe what you want.

If you somehow get a kick out of running the fuel level past where you can read it, have at it.

 

['05Train]

In the manual? Who said that?

Likewise on the believe what you want.

If you somehow get a kick out of running the fuel level past where you can read it, have at it.

No "kick" at all. As I said, show me where any manufacturer states that you can't use the full capacity of the tank. I'll wait.

 

[PoManzAWD]

No "kick" at all. As I said, show me where any manufacturer states that you can't use the full capacity of the tank. I'll wait.

I really didn't want to play anymore, but here you go, directly from Subaru:

"Most drivers are familiar with the low-fuel warning light. The low-fuel warning light illuminates when the fuel tank is nearly empty. It indicates that fuel is required promptly to prevent an out-of-fuel condition. It has been a common feature on dashboard instrumentation for many years."

From here: Subaru Drive : Modes of Operation: Engine Oil, Maintenance, and Warnings (fall13)

 

['05Train]

I really didn't want to play anymore, but here you go, directly from Subaru:

"Most drivers are familiar with the low-fuel warning light. The low-fuel warning light illuminates when the fuel tank is nearly empty. It indicates that fuel is required promptly to prevent an out-of-fuel condition. It has been a common feature on dashboard instrumentation for many years."

From here: Subaru Drive : Modes of Operation: Engine Oil, Maintenance, and Warnings (fall13)

Not sure what your point is. The low fuel light is there to prevent you from getting stranded, it doesn't say word one about potential damage.

Believe what you like, you won't hurt the car by using 15 gallons of gas per fill-up.

 

[RyanSTL]

Guilty. I'm always waiting until the last minute to fuel up. I'm not proud, just lazy.

 

[soakes]

I ran mine so low last week that the amount of klm to go disappeared.

I do this on pretty-well every single tank (unless I'm a long way from a petrol station). So far I haven't had any problems at all and don't expect any.

 

[gravitylover]

I put in 15.68 gallons the other day. I don't do this regularly but all of the gas stations that I pass between work and home are 20-40 cents a gallon more than this one near my house and I was (pretty) sure I was going to make it. When the last bar on the gauge went off as I passed the Exxon station I thought twice about going any further but that's the most expensive gas station for 20 miles around so I took the chance.

 

[MAINIAC XV]

I put in 15.68 gallons the other day. I don't do this regularly but all of the gas stations that I pass between work and home are 20-40 cents a gallon more than this one near my house and I was (pretty) sure I was going to make it. When the last bar on the gauge went off as I passed the Exxon station I thought twice about going any further but that's the most expensive gas station for 20 miles around so I took the chance.

A man after my own heart. Not on the XV but back when living in Carmel the wife and I made trips on weekends to check out homes in different areas of Maine. One time I didn`t refuel in Maine and wanted to make it back on one tank. Well when we got back to Carmel I pulled into the gas station across from the strip mall and left the SHO running while gassing up and it took pretty near a full tank within a couple of tenths also. My wife let me know she wasn`t happy with me trying to make it back running on fumes.

 

[gravitylover]

Yeah since the advent of fuelly I don't do it anymore but I used to put in 50 cents if that's what it would take to get to a station more reasonable than what was easy and in front of me.

 

[Montanan]

Guilty. I'm always waiting until the last minute to fuel up. I'm not proud, just lazy.

Same here. There's really no logical reason to wait, but procrastination is my life.

 

[Dave55]

Hello all,

New member here.

I have a 2018 Crosstrek which I love. I bought it new after when the transmission went at 298K miles in my 98 Outback.
Love the Crosstrek,

I just pumped 17.5 gallons of gas into it according to the meter at the BP station. I've never put more than 16 gallons in before and that was when there were no bars showing on the fuel gage. Today there was one bar showing, low fuel lite was on and meter said I had 40 miles left on tank.

Should I smell a rat? Never had a problem at this station before.

Manuel says 16.6 gallons. I looked all around and under car and nothing was overflowing.

Thanks all in advance

Dave