Excess fuel consumption

[Virtual Genocide]

Ive been noticing my fuel consumption getting worse and worse over the last few weeks. At first i just thought it my have been a combination of the colder weather and my sidedraft dellortos, cam, etc etc. But my current 0.5 tank of gas has lasted me 60kms this can't be right, its only a 1300cc and i haven't been revving it much or accelerating hard (because i thought it was the cold weather etc).
Today i had a look under my car, followed all the fuel lines couldn't see any obvious leaks, felt around the top of the tank where both lines enter, nothing. It has a new fuel filter and rubber hoses, but the lines will be 20odd years old.

Is there somthing im missing or should i put up with 120km out of 30ltrs

Thanks in advance

Phil

[sergei]

maybe gauge is faulty? 20yo?

[Caveman]

Do an air:fuel test. That will rule out if the engine is running (very) rich.

Then redo all the seals around the feed/return/breather into the tank. Then look at the fuel pump on the engine.

[Defective]

Do an air:fuel test. That will rule out if the engine is running (very) rich.

Then redo all the seals around the feed/return/breather into the tank. Then look at the fuel pump on the engine.

or do you have dodgy neighbours that are helping themselves to your gas....

[edwagon]

LOL, i fixed an excessive fuel consumption problem by fitting a locking petrol cap once, damn hoodrats

Check your plugs or even how sooty the back of the car is getting (near exhaust pipe), if it doesn't seem to be running rich and performance hasn't changed, it has to be either leaking, evaporating, your fuel gauge is misreading or someones milking your tank

[EVL20V]

mayb u thought u put $30 in but instead put $3 in? and also have a dodgy gauge

[Defective]

mayb u thought u put $30 in but instead put $3 in? and also have a dodgy gauge

plus. $30 only gets ya 20 litres (roughly) so it wont last as long as it used too

[Adamal]

How is the engine feeling to you? Not performing as it normally does? Could be the carbs need a good clean?

[matt dunn]

Welcome to the world of owning a car with sidedraughts. LOL

Seroiusly though,

Presuming it's a 4K as you say 1300cc,

The fuel pump has a small vent hole on the underside of it to allow the air in and out as the diaphram moves. Ifr the diaphram leaks it will squirt a small amount of fuel out this hole each time the diaphram moves.
Hold you hand near it while the car is running and you may feel or see it.
I have struck this once or twice.

Matt

[Virtual Genocide]

Thanks all, for your info.

The car has been recently tuned so yes the carbs are clean, the mixture is fine and it running better than ever

Yeah i always expected the sidedrafts to be quite thirsty, the fuel pump is fairly new but i'll check this vent hole, hopefully its that.

I might try and find one of these locking fuel caps, it could very well be people syphoning the fuel out.

Thanks again.
Phil