Okay, explain this one......

Site Subscriber Joined: 29 Jan 2005 Posts: 1108

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

Posted: Sat Jun 25, 2005 10:56 pm

Got some Shit in the tank?

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

Fuel filter or pump are my bets

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

I reckon youre imagining it...

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

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

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

why would more fuel make higher fuel pressure? its not gravity fed you know.

Site Subscriber Joined: 10 Jun 2004 Posts: 2317

Neal 19 16v wrote:

why would more fuel make higher fuel pressure? its not gravity fed you know.

Fair enough, was just a though

Spammer Joined: 27 Jul 2004 Posts: 5717

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

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

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.

Site Subscriber Joined: 29 Jan 2005 Posts: 1108

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

Spammer Joined: 27 Jul 2004 Posts: 5717

i solved the problem you see Laughing

where else do you expect the pump to be btw ?

Site Subscriber Joined: 29 Jan 2005 Posts: 1108

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

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

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?

Spammer Joined: 27 Jul 2004 Posts: 5717

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

Site Subscriber Joined: 29 Jan 2005 Posts: 1108

I ain't got no fuckin clue. Hence why I asked the question Rolling Eyes

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

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

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

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.

Site Subscriber Joined: 29 Jan 2005 Posts: 1108

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

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

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

Site Subscriber Joined: 29 Jan 2005 Posts: 1108

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

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

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