you've piqued my curiosity about *why* you want to transfer (especially weekly). Wouldn't it be easier just to switch the station at which you fill up? (or to take her car to put some less expensive gas in it)
Seems like a lot of work to solve a non-existent problem.
My advice is to learn to live with it or fill the wife's tank for her. Transferring gas in the grage is plain DUMB. My brother set the house on fire 50 years ago doing that. He was a kid and did not know any better.
Even at 10 a gallon difference, you'd save $1.50 a week. Worth the risk? Worth the time and trouble and expense of a pump? Find a reasonalbe priced station on her route and use it regularly.
My car I cant even get a siphon hose into, its a theft saftey device, probably one of your cars has it. It would still be best to get her to switch for other reasons.
Go out for donuts and coffee every Saturday morning while your wife sleeps in. Take her car, and fill it up yourself while you're out. Don't tell her why; simply let her assume it's because you're a loving, devoted husband, and reap the rewards of that assumption.
Do The Math, Part I -- how much time and gas do you spend, driving out of your way to get the least expensive gas you can find? If you drive five miles out of your way to save a nickel a gallon, you're effectively placing a value of less than /hour on your time.
Do the Math, Part II -- what's the difference between what you pay, and what she pays? Maybe 10-12 cents per gallon? So the fifteen gallons you propose to transfer every week represents a savings of .50 to .80 a week in gasoline costs. How many years before the pump pays for itself?
Do the Math, Part III -- Repeat the previous calculation, subtracting a reasonable value for the time you spend doing this from the amount you save on gas. *Now* how long before the pump pays for itself? (Hint: if the value you place on your time exceeds about /hour, the answer to this question is "never".)
Do the Math, Part IV -- if your wife is using fifteen gallons of gas a week commuting to and from work, you need to buy her a more fuel-efficient car. I can drive my Saturn over 400 miles in the city, and over 500 on the highway, on fifteen gallons of gas. I bet your wife isn't driving 80-100 miles a day.
Just about any pump made for the purpose should work.
There ARE alternate ideas, some of which have been mentioned.
My favorite would be the reverse of what you propose: Remove some (amount of) gasoline from HER car and put it in YOUR car. As the price she must pay to run errands increases dramatically, she may, on her own, move to reduce her expenses.
I switch stations all the time but my wife does not. I work near Costco which is only about $2.90 a gallon nowadays while the gas stations she goes to are $3.10 or so. We live very far (20- miles) from the nearest gas station. She would love it if the "gas tank just filled itself".
She grew up in the only state in the USA that has true self serve (where you stay in the car the whole time) and she hates those "cash only" stations that make you wait in line at the checkout twice just to fill up. So she goes to the expensive fill up stations which are more convenient and closer to where she shops.
Of course as you suggested, I could just go out at 6am or 11pm and simply take her car out for gas, it would be much less work to just fill up her car from a tank at home.
I considered buying a 500 gallon gasoline tank but then I learned that gas goes stale so that would only be useful for commercial establishments.
Anyway, there must be someone else with a similar problem that has found a workable solution.
Never had that problem where I live, as there are many options. Seem the easiest option is to switch cars when she gets low, and fill hers up at the Costco. Of course one of you may find reason to reject that option. Which means it just ain't that important. Any gas transfer scheme is plain stupid, both from the cost and safety perspectives.
You already have a fuel pump in your tank. Tap the fuel rail on the engine. There is usually a drain tap there. Connect a hose to that, stick it in your wife's gas tank filler and turn the key on.
I thought you were joking. Do you really think it's worth buying a pump or taking any chances? How many miles do you and your wife drive? This sounds more like a domestic argument that got out-of-hand.
Depends on the make and model. If there isn't it's not a big job to put a union and tap valve there. Fuel constantly circulates from and to the tank around the rail. It's a good place to tap off.
I have in fact used a line from the fuel rail to fill a generator fuel tank from a car in an emergency situation. You can do it. It's not something I'd want to do except in an emergency, though.
The thing is, though... you have a social problem. Technical solutions don't solve social problems, and attempts to solve social problems with technical solutions result only in disaster and angry wives.
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