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Old 04-27-2006, 08:27 PM   #1
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Is it bad to fill up gas when your tank is half full?

I heard it may mess up your fuel pump but I'm not so sure. I've been getting bad gas mileage lately in my '04 Focus PZEV, I mean just traveling at 55 mph constantly for like 20 minutes will eat up the gas by 2 notches indicated at the fuel gauge. It's almost like 22 or less mpg highway, worse in city driving. Would it have to do with the fuel systems or is the PZEV Focus really bad in gas mileage compared to the regular Zetec Focuses? With gas prices the way they are these days, this is really serious!


EDIT: BTW, if it helps my car currently has around 13,800 miles on it.


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Old 04-27-2006, 09:14 PM   #2
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I have no clue what the answer to that question is BUT I can tell you this: If you see a Tanker filling the station. Go somewhere else. The reason is when they fill the tanks, it stirs the sediment in the tanks that could then get into your car. If you already knew that, sorry. But thought I'd let you know.
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Old 04-27-2006, 09:18 PM   #3
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Oh, so you're saying those sediments could accumulate in the tank, thus clogging up the fuel pump resulting in bad gas mileage?

It didn't necessarily answer my question, but it did lead to a good clue, but I'd still like to know if filling up the gas tank when it's halfway full is a good thing.


I thought Focuses where "econoboxes"? It now has the gas mileage of a full blown Escalade.
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Old 04-27-2006, 09:35 PM   #4
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check you spark plugs and injectors too.
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Old 04-27-2006, 09:35 PM   #5
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it doesn't matter what so ever if you fill at 1/4 1/2 oe 3/4 tank. doesn't matter at all. just try to use the advice ^^^^ he just gave ya.
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Old 04-27-2006, 09:48 PM   #6
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Yeah, on my SVT the stock plugs were pretty crap. As soon as I replaced them and the plug wires, there was a very noticeable difference in gas mileage.
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Old 04-27-2006, 10:27 PM   #7
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Quote:
Originally posted by slikirish
it doesn't matter what so ever if you fill at 1/4 1/2 oe 3/4 tank. doesn't matter at all. just try to use the advice ^^^^ he just gave ya.
Hmm, that's what I thought. It's just that my automotive diagnostics instrustor in college advised us not to fill up our gas tank when it's still kinda full since it had something to do with the fuel pump in which I forgot why and how. I thought that really applied to my Focus since that's what I've been doing all along to save gas money these days. Now it's been giving me crappy gas mileage no matter how much I baby it or how economical I drive.

I'll probably have my spark plugs checked then and replace them with better ones, probably platinum since they're claimed to last longer and gives better gas mileage. I'll probably check the injectors, too, but I surely hope that's not the case since my whole car is pretty young (only 13,800 miles).

Last edited by ElCapo; 04-27-2006 at 10:33 PM.
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Old 04-27-2006, 10:56 PM   #8
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i replaced my plugs not to long ago...should i invest in new spark plug wires???
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Old 04-27-2006, 11:13 PM   #9
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When I ran out of gas in my ZX2 and burned my fuel pump out the parts guy at NAPA told me th fuel cools the pump. Don't know, but my Dad was telling me the same thing before the NAPA guy. I've heard this from other sources as well.

Don't see the harm in filling up early, but have seen the harm in not filling up enough.
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Old 04-27-2006, 11:14 PM   #10
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well ive heard of not letting ur tank get to empty all the time. like gettin down below a quarter of a tank. it doenst matter where its at when u fill it up. also check ur air filter. that might need to get cleaned.
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