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Fuel starvation after replacing fuel tank


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11 replies to this topic

#1 hal1971

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Posted 17 January 2012 - 11:16 AM

Just before christmas, I've replaced the fluel tank on my impreza 2002 TS hatchback.

The fuel tank was almost empty, after the replacement, I did 10-15 miles driving without problems. The trouble started after fueling the car full. after 1 miles of driving, the rpm was going up and down, the car was stuttering and shaking. I was able to drive home and tested the car a low speed with this problem happening more ofter.

The next morning I started the car and leave it heat for 10 minutes and when I stepped on the pedal, the car died... So I called the mechanics to have my car towed so they can check the trouble. after verifying everything ( emptying half the tank doing so). They told me it was my Gas cap that was broken and gave a generic one.

With the new gas cap and half a tank, everything was fine, car running great. I did almost 250 miles, but being not sure of the gas cap problem, I never fulled the car full, always in the half 3/4 range.

Last week I fueled the car full, guest what, starvation again...

For now i'm driving without cap and everything's fine, I have the check engine led, but car running great.

A original gas cap cost 35$ buck, the dealer needed my serial because they where 2 kind of cap that year and told me I SHOULD by an original...

My question: Can a broken gas cap do this kind of trouble ???

#2 naru

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Posted 17 January 2012 - 12:13 PM

Yes,if the vacuum relief valve doesn`t work.

#3 nipper

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Posted 17 January 2012 - 04:35 PM

Yes the tank is not getting fresh air as it uses up fuel, so you get a vacume lock. If it is really bad you can crush the fuel tank.

#4 johnceggleston

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Posted 17 January 2012 - 07:57 PM

who installed the tank??

any chance the hoses got mixed up, kinked, twisted??

#5 hal1971

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Posted 18 January 2012 - 09:27 AM

who installed the tank??

any chance the hoses got mixed up, kinked, twisted??


I hope they checked that, because I had to return twice, the first time they told me they did a shampoo and it was condensation, the second time, they told me it was the gas cap. Do I really have to buy a Subaru Cap or I can go OEM ?

#6 johnceggleston

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Posted 18 January 2012 - 01:58 PM

I hope they checked that, because I had to return twice, the first time they told me they did a shampoo and it was condensation, the second time, they told me it was the gas cap. Do I really have to buy a Subaru Cap or I can go OEM ?


i doubt it is the cap, but if you want to try oem, buy a used one.

i'd make the shop that installed the tank fix it. something is not right.

#7 1 Lucky Texan

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Posted 18 January 2012 - 02:33 PM

fill the tank near the shop, leave the cap loose, drive carefully to the shop, fastne cap normally and take mechanic for a ride.

make sure this will duplicate the problem.

they installed something wrong, broke something,or got a bad part.

#8 naru

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Posted 18 January 2012 - 08:55 PM

Probably pinched the breather line.
Tank should not have to breathe through the gas cap.

#9 hal1971

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Posted 19 January 2012 - 09:35 AM

I'm very unlucky with this car, each time I go to a shop for a fix, I have to return because something is wrong. Is Subaru so hard to work on ;)

I'm in the process of buying a new sub, I will leave the old one at the shop so they can check and recheck...

#10 1 Lucky Texan

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Posted 25 January 2012 - 04:26 PM

how did this turn out?

#11 hal1971

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Posted 26 January 2012 - 12:25 PM

Did not have the chance to bring it where they installed the tank and frankly i'm not sure I want them to work on it anymore. If it's the breather line, is it a costly job to have it checked ?

I'm still running with no gaz cap, everything seems to be fine.

#12 hal1971

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Posted 14 February 2012 - 12:25 PM

A little update,

Had to go to a subaru dealer for a recall.
Since I was there I asked them to check my tank installation, they analysed the check engine code and told me it was surely a cable piched under the new tank. a 4-5 hour job to check at 110$. So I asked them if I can continue driving without my gaz cap and they told me that it's not a problem. I'm driving like this since then and car's running fine.




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