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 Okay, explain this one......
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simonds1
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Joined: 29 Jan 2005
Posts: 1108

Posted: Sat Jun 25, 2005 7:12 pm

There is a noticable improvement in the performance of my car when it's got a full or nearly-full tank of petrol, than when it's running low (between empty and a quarter full-ish). Um............WHY?? Confused

I used to think it when I first had the car, and so I used to run it quite full all the time, but then I kinda got bored and ran it 'normally' and hadn't thought about it since. But today I filled her up to the brim, and it's like a different car I tell thee. Makes not ONE bit of damn sense though! Any ideas?? Confused
mals
Self Proclaimed Comic Genius

Joined: 04 Jul 2004
Posts: 3482

Posted: Sat Jun 25, 2005 10:56 pm

Got some Shit in the tank?
huwwatkins
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Joined: 10 Jun 2004
Posts: 2317

Posted: Sun Jun 26, 2005 3:14 am

Fuel filter or pump are my bets
Neal
Forum Moderator

Joined: 18 Feb 2004
Posts: 7432

Posted: Sun Jun 26, 2005 3:17 am

I reckon youre imagining it...
huwwatkins
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Joined: 10 Jun 2004
Posts: 2317

Posted: Sun Jun 26, 2005 6:08 am

Neal 19 16v wrote:
I reckon youre imagining it...


Thats possible, earlier I was convinced my 16v's steering was wandering Razz

Just a thought though, with a full tank there would be more weight in fuel so fuel pressure would be marginally higher, so if he had a slightly knackard fuel pump or manky fuel filter it might help?

Just a thought Razz
Neal
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Joined: 18 Feb 2004
Posts: 7432

Posted: Sun Jun 26, 2005 6:25 am

why would more fuel make higher fuel pressure? its not gravity fed you know.
huwwatkins
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Joined: 10 Jun 2004
Posts: 2317

Posted: Sun Jun 26, 2005 7:04 am

Neal 19 16v wrote:
why would more fuel make higher fuel pressure? its not gravity fed you know.


Fair enough, was just a though
schakal
Spammer

Joined: 27 Jul 2004
Posts: 5717

Posted: Sun Jun 26, 2005 7:15 am

why would not the fuel amount make a diference if the pump is at the bottom of the tank ,more fuel = less air in tank thus pump pumping fuel but only fuel

i am standing to be corrected with sarcastic comments as always Laughing
Neal
Forum Moderator

Joined: 18 Feb 2004
Posts: 7432

Posted: Sun Jun 26, 2005 7:35 am

well if you let the tank run empty enough that the pump is sucking up air, of course you will be down on power.. ie it wont actually run at all.
simonds1
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Joined: 29 Jan 2005
Posts: 1108

Posted: Sun Jun 26, 2005 7:36 am

Yeah, I did think what huw said at first, more weight would be easier to pump, but like neal said, that would only be true if the pump was at the bottom of the tank and was gravity fed.....and it's completely the opposite. And I've been known to imagine a few things, but not this. Maybe my petrol guage is fucked and when it's down about a quarter full, the tanks actually nearly empty and so it's not running as well? But it's not as if I get fuel starvation problems like stuttering or hesitation etc. Just the car feels slower and as though it's killing itself getting there. But with full tank feels quicker, and is lovin it Confused
schakal
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Joined: 27 Jul 2004
Posts: 5717

Posted: Sun Jun 26, 2005 7:38 am

i solved the problem you see Laughing

where else do you expect the pump to be btw ?
simonds1
Site Subscriber

Joined: 29 Jan 2005
Posts: 1108

Posted: Sun Jun 26, 2005 7:43 am

well it's at the top of the tank, is it not? So therefore the weight of fuel makes bugger all difference. Unless I'm driving upside down of course
Neal
Forum Moderator

Joined: 18 Feb 2004
Posts: 7432

Posted: Sun Jun 26, 2005 7:55 am

Well its a pointless discussion anyway, the fuel pump pressurises the fuel to 2.5bar, you think a miniscule difference of fuel pressure at the pick up is going make any difference to the pump output?
schakal
Spammer

Joined: 27 Jul 2004
Posts: 5717

Posted: Sun Jun 26, 2005 8:00 am

thats enough i give up with you lot Confused i will buy myself a nice nova gte and a burberry cap and start growing weed in the garden
simonds1
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Joined: 29 Jan 2005
Posts: 1108

Posted: Sun Jun 26, 2005 8:01 am

I ain't got no fuckin clue. Hence why I asked the question Rolling Eyes
Dan
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Joined: 28 Jan 2005
Posts: 3547

Posted: Sun Jun 26, 2005 8:05 am

schakal wrote:
thats enough i give up with you lot Confused i will buy myself a nice nova gte and a burberry cap and start growing weed in the garden


wow money does growon trees Razz
Chris H
Forum Moderator

Joined: 02 Mar 2004
Posts: 19978

Posted: Mon Jun 27, 2005 12:09 am

the pump is right at the bottom fo the tank whewre else would be!

Ayway chances are you have a slightly porous braided hose between the pump and the pump holder.
simonds1
Site Subscriber

Joined: 29 Jan 2005
Posts: 1108

Posted: Mon Jun 27, 2005 1:03 am

Well the pump is AT the top innit? But it extends to the bottom right? Much the same way that a drinking straw is kinda at the top of a drink, but sucks from the bottom? Oh I dunno. Think I'm just gonna get a new one anyway. Fed up of the noise mine makes, even if everyone does keep telling me it's okay.

bbbbbuuuuuuuuzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz Rolling Eyes
Chris H
Forum Moderator

Joined: 02 Mar 2004
Posts: 19978

Posted: Mon Jun 27, 2005 1:11 am

heres an idea stop fucking moaning about it I'm fed up hearing about it for 1!
simonds1
Site Subscriber

Joined: 29 Jan 2005
Posts: 1108

Posted: Mon Jun 27, 2005 2:20 am

Don't keep lookin at the post & replying then lol. I will be quiet now anyway, cuz it ain't a question with a straight forward answer is it......so it ain't never gonna get answered. Only did the post in the first place incase anyone was like "ahhhh yeah, I know.......common problem.......That'll be your.....erm......" yeah whatever
Chris H
Forum Moderator

Joined: 02 Mar 2004
Posts: 19978

Posted: Mon Jun 27, 2005 2:58 am

go to renault and buy a new fuel pump, job done. right part dear price keep you happy.
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