328 Only Takes 10 Gallons

I've had my 308 GT4 for about 3 months. however low it gets, even if the light is on, I can't get more than 12-13 gallons in it. I also notice that the gas hose shuts off alot, I guess that's because of bad geometry of the fueling pipe.

 

Let me throw out another possibility- F fuel gauges are not know to be the most accurate. I'd guess you're filling up a tank that's only about half empty, and that's your only problem.

 

Mine's got a low fuel light in the fuel guage. Assuming you are talking about US Gallons it should take a lot more than that. According to the manual it should hold 74.3 Litres of which 18 litres is the reserve (i.e.when the light will come on I guess) & from what I've seen that's about right.

In US Gallons that's about 19.5 & 4.75

HTH

I.

 

I would suspect the gauge as well. (And if that's the case, the warning light will probably be no more accurate.)

I can't recall ever getting more than about 14-1/2 gallons in mine, even with the warning light on.

(And if it matters, I switched to mid-grade gas (89 octane on the U.S pump) several fillups ago, and the engine seems to like it just fine! I mainly use BP/Amoco, by the way.)

 

Mine does the same thing...I look at the gage and see I need gas, but it only needed 8 or 10 gallons. It's got to be the gage...the light works off the same sensor, so I wouldn't trust it either.

I dodn't see how the line connectine the tanks could ever be clogged, it's huge. Mine is new and clean, so I know that is not my problem.

I keep meaning to just figure out my fuel milage...but I always forget. Witht he milage measured and the tank capacity from the owers manual you can just set the tip counter when the tank is full will tell you when to worry.

On another related topic, does anyone else have trouble filling the tank? I have to pull the nozzel about 1/2 way out and fill slowly on it clicks off....very annouying.

 

I seem to get around 17-18mpg pretty much regardless of what I do (thata be about 22mpg in the US).

No problems filling the tank at all - its like a black hole - sucks in gas faster than I can pump it (!)

I.

Scary Gas fact of the week: A Mclaren Mercedes SLR will empty its 21G (26.25USG) gas tank in 19 minutes when run flat out at 200+mph (source: "Top Gear" this week).

 

I find that you need to work the gas pump to fill up the tanks on my 308. You should be able to get gas up to the fill cap. Just need to work the nozzle. Also as you fill the tank gas will foam and trigger the nozzle. So you need to play with it and you will be able to fill it right to the cap.

 

I have the same problem; I have to keep squeezing the handle at a relatively slow fill speed to keep the pump from shutting off. I think it has to do with the relatively horizontal angle of the 308/328 fuel nozzle.

 

I have the same thing; tried different positions. maybe the two things are related. maybe I could put more fuel in but it clicks off even more the more I fill it.

 

the fuel level sending unit has two parts - a switch that turns on the reserve idiot light, and a rheostat/variable resistor which feeds the fuel guage.

The only thing the two circuits share is a ground.

If the fuel guage is reading empty, but the idiot light is off, then you are getting extra resistance in the circuit - probably from one of the two connectors between the sender and the gauge.

There's a couple spade connectors on top of the fuel tank, plus the ground wire. They are easiest to get to if you unbolt the coil mounting bar and move the coils aside. The spade connector closest to the firewall is the idiot light.

The schem says the other connector in the circuit is behind the passenger footrest.

The vent line on the filler neck goes to the same tank that the gas is dumping into, and the filler neck nozzle size restrictor blocks a lot of the vapor flow, so pumps that are sensitive to the pressure are a pita.

The fuel pipe between the tanks is a little over an inch in diameter. If that thing has a blockage, it'd be impressive

 

BTW, 3x8 fuel gauges are notorious for their inaccuracy. Usually for the reasons wolftalk just described, but there were reports of problems when the cars were new.

 

Ck out all the connections 1st.
Gauges seldom fail, are basicly simple voltmeters.
Can get the sender & meter from ferrari.uk. (register with owners.ferrari.com, log in, keep clicking on [spare parts] until you've got the ferrari.uk parts catalog.)