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 Posted: Sun Nov 11, 2012 2:41 am |
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Joined: Nov 11, 2012
Posts: 8
Trade Rating: 0
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If the fuel tank gets air inside is there any problem? if there is no air how much vacumm should be? thank you
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Posted: Mon Nov 12, 2012 2:45 pm |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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air in the fuel lines isnt great, but what happens when you fill up with petrol do you think???
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Posted: Mon Nov 12, 2012 4:57 pm |
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Joined: Nov 11, 2012
Posts: 8
Trade Rating: 0
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I have leak in fuel pump.when the car is turned om for 3 minutes the vacumm is 10 hg and after 3 minutes it goes 0 hg, when i turn off the car the vacumm decrassed immediatly.I want to know what kind of problem is this?thank you
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Posted: Tue Nov 13, 2012 8:03 am |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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Is the car actualy running right?where do u see the leak?because its totaly normal to have air in the tank...the vaccum is at the engine i believe...ive had fuel leak problem and just renewed the plastic ring that holds the pump on the top of the tank...dealer part of around 10quid."
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Posted: Wed Nov 14, 2012 12:13 pm |
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Joined: Nov 11, 2012
Posts: 8
Trade Rating: 0
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the car is running actualy, I connect the vacuum test gauge between fuel filter and injection pump model lucas DPC, when the engine was turned on,the vacuum was 10 nhg,and than when I turned off the engine I think that the vacuum should stay stationary, but it decrased immediatly. thank you
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Posted: Wed Nov 14, 2012 12:54 pm |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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Are you sure it's vacuum that it's measuring and not fuel pressure?
A vacuum has nothing in it, no air, no fluid. The pump will draw the fuel from the tank and push it along the fuel lines which will create the fuel pressure. Turn the engine off, the pump stops working and so the pressure will drop to zero.
Get a straw, cover one end with your finger and suck on the other. In theory, you're creating a vacuum in the straw. The straw will collapse in on itself. If this happened in your fuel system, the pipes would collapse and restrict the flow of fuel to the engine causing the engine to stall or run like a bag of s**t due to lack of fuel.
You need atmospheric pressure in the tank so that as the fuel is used by the engine, the space is filled, otherwise the pump will have to work much harder as the fuel in the tank decreases.
I have just searched Ektor and was hoping to find it was a translation for internet troll. Alas, I think you may be genuine. 
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Posted: Wed Nov 14, 2012 1:23 pm |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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U still havnt said where you think the leak is at...you do know that the fuel tank has a return pipe on it sending any unused fuel back to the tank?and is it pety or diesel?
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Posted: Wed Nov 14, 2012 1:35 pm |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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i just think you want to show off because youve flukely found out what this measure hg means....there's no vaccum involved here.there is fuel pressure thanks to the fuel pump but no vaccum....the vaccum pump is for the brakes....not the fuel system.im just honest mate....sui me
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Posted: Wed Nov 14, 2012 2:49 pm |
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Joined: Sep 21, 2011
Posts: 317
Trade Rating: 0
Location: UK
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There is a slight vacuum in the tank, for emissions reasons.
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Posted: Fri Nov 16, 2012 11:19 am |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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hows that then???i reallise the extraction of fuel by the pump would create a slight negative pressure in the tank but where does emmisions come into it?
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Posted: Fri Nov 16, 2012 12:27 pm |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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| paul_c wrote: |
| There is a slight vacuum in the tank, for emissions reasons. |
I've got a fully functioning breather pipe on my tank. It connects to the top of the tank and comes out near the filler cap. I'm not sure if the filler cap itself has a breather hole in it on a 206. I will have a look next time I fuel up.
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Posted: Fri Nov 16, 2012 4:56 pm |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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No the more i think about a vacuum in the fuel tank the more wrong it sounds....it would serve no purpose and every time u filled up takin the fuel cap off would give u a nasty shock as the vacuum was released...probably dangerouse aswell
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