1998 mitsubishi challenger noise in fuel tank

Submitted: Saturday, Jun 02, 2012 at 17:04
ThreadID: 95977 Views:1685 Replies:4 FollowUps:6
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I have a clunking noise in the fuel tank like something has come loose, can anyone give me any ideas. When you reverse and put the break on you hear it like wise if you go forward and put the break on you hear it clunk a couple of times like it is swishing in the petrol.
I spoke to a mechanic but he had no real info for me. Thanks
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Reply By: Roughasguts - Saturday, Jun 02, 2012 at 17:31

Saturday, Jun 02, 2012 at 17:31
Have you had the car long?

It could be the end of a jiggle syphon hose or similar that dropped down the neck of the fuel inlet some time.

Might be the strainer on the bottom of the fuel pump but I dought it would make much noise it's only light plastic.

Cheers.
AnswerID: 487460

Follow Up By: splits - Saturday, Jun 02, 2012 at 21:15

Saturday, Jun 02, 2012 at 21:15
"It could be the end of a jiggle syphon hose"

That is exactly what I found inside my tank soon after I bought the car. After removing the tank and getting it out, I couldn't for the life of me work out what it was until my next door neighbour identified it.
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FollowupID: 762720

Follow Up By: Ron N - Saturday, Jun 02, 2012 at 21:41

Saturday, Jun 02, 2012 at 21:41
Nearly all vehicles built in the last 25 yrs have a valve or restriction in the filler pipe to prevent fuel siphoning (anti-theft protection). Are Mitsy-Bitsy so tight, they don't even provide this basic protection?

I would have thought a clunking noise in the tank would be the filter over the end of the suction pipe had come loose. The length of time the car has been owned is a crucial point.
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FollowupID: 762723

Follow Up By: Roughasguts - Saturday, Jun 02, 2012 at 21:50

Saturday, Jun 02, 2012 at 21:50
Nah that restrictor in the filler neck is! ...was! for so you could only get the ULP pump nozzle to fill your car if it was designed to run on ULP.

Super or LRP had a fatter nozzle that would not fit in the ULP tank and the flap insured that the petrol flow would cut off.

Cheers.
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FollowupID: 762724

Follow Up By: Ron N - Saturday, Jun 02, 2012 at 22:25

Saturday, Jun 02, 2012 at 22:25
Roughasguts - I'm not talking about the restrictor in the filler neck. Nearly all vehicles have a restriction in the lower section of the filler pipe down near the tank, that is an anti-siphoning measure.
Do a Google search on "siphoning fuel" and see how many young blokes on forums are wailing about why they can't suck any fuel out of their car fuel tank with a hose?!

Cheers - Ron.
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FollowupID: 762730

Follow Up By: Roughasguts - Saturday, Jun 02, 2012 at 22:31

Saturday, Jun 02, 2012 at 22:31
Oh okay Ron didn't know that! ....But so far I have not had a problem with a 10mm hose pushed down into me tank. I run 10 litres out every so often for the Garden stuff.

Actually 1 Mitsi and 2 x Toyotas from 1994 to 2004.

Cheers.
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FollowupID: 762731

Follow Up By: Ron N - Saturday, Jun 02, 2012 at 22:41

Saturday, Jun 02, 2012 at 22:41
Yeah, if they haven't got a specific anti-theft, siphon-stopper installed, the filler pipe normally has a one-way valve, that lets fuel in and stops vapours from getting out.
This is part of the vapour-control system that prevents fuel vapours from escaping into the atmosphere, that has been part of pollution controls since the late 1970's.

Cheers - Ron.
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FollowupID: 762733

Reply By: Life Member - Doug T (NT) - Sunday, Jun 03, 2012 at 07:03

Sunday, Jun 03, 2012 at 07:03
Did you manage to find an old Esso Service Station somewhere...lol

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AnswerID: 487482

Reply By: Sacred Cow - Sunday, Jun 03, 2012 at 07:59

Sunday, Jun 03, 2012 at 07:59
Could be a baffle plate. If you remove the top cover you may be able to get to it and remove it. Had this happen to me once and it took ages to locate the cause of the baffling baffle noise.

Glenn
AnswerID: 487484

Reply By: Marg G - Sunday, Jun 03, 2012 at 15:51

Sunday, Jun 03, 2012 at 15:51
Thanks for the replies, we have had the car 12 years and this problem has just developed.
AnswerID: 487516

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