Fuel Cap

Technical questions and answers about the Mazda Bongo

Moderators: Doone, westonwarrior

Post Reply
User avatar
brorabongo
Supreme Being
Posts: 3226
Joined: Wed Jan 17, 2007 5:56 pm
Location: Brora, Sutherland

Fuel Cap

Post by brorabongo » Sun Jul 04, 2010 7:43 pm

When undoing the cap just now, there was a hiss as it sucked in air, I know this is quite common. Is there a reason the tank needs to be sealed untill the vacuum reaches a point were the cap lets air in.

Here is the pressure relief valve parts in the cap, for now I run without it....it will be safe will it? 8-[
Image

As I was filling to the brim with oil, diesel started to pour out the tank vent just inside the filler pipe, so I know the vents clear.
ボンゴの激怒 pictures
Run your fingers over my Bongo, and I'll run my Bongo over your fingers!! :twisted:
User avatar
Northern Bongolow
Supreme Being
Posts: 7722
Joined: Mon Mar 15, 2010 11:33 pm
Location: AKA Vanessa

Re: Fuel Cap

Post by Northern Bongolow » Sun Jul 04, 2010 11:18 pm

it may be that diesel expands when hot, or shrinks when cooling, and the cap must not leak under normal use,it must let air in when the level in the tank drops,it does all this by the little valve,but if under hard cornering it pours out,or the vacuum is to great then the cap is faulty.or needs cleaning out.
Post Reply

Return to “Techie Stuff”