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fuel tank vacum

Tech Talk for Nissan owners.

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Posts: 11
Joined: Tue Apr 25, 2006 12:31 pm
Location: alice springs

fuel tank vacum

Post by andy preuss »

when i undo the cap on my gq td42 i always have a vacum present.
is this normal. cheers
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Post by tweak'e »

i don't know that vehicle but generally if you have a lot of tank vacuum especially after a long run, then its usually the one way valve on the breather line that gets blocked. common fix is to drill a tiny wee hole in the fuel cap. otherwise see if you find the pipe/valve and clean it out.
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Post by tweak'e »

i don't know that vehicle but generally if you have a lot of tank vacuum especially after a long run, then its usually the one way valve on the breather line that gets blocked. common fix is to drill a tiny wee hole in the fuel cap. otherwise see if you find the pipe/valve and clean it out.
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Post by MyGQ »

check the cap itself,

this usually means that cap's one way valve to let the air in when the tank starts to empty might be stuffed and you may need a new fuel cap
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Post by Vulcanised »

i have the opposite..... when i loosen the cap to fuel up, and i have a long range tank.... it breathes for about 10 seconds sometimes. I should check my breather as well.
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Post by MyGQ »

does it suck air in or blow it out? if it sucks in, there is a problem with the cap. if it blows out, its the internal breather
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