| Author | Message | ||
| bruno bandaras (Originalsinner)
Junior Member Username: Originalsinner Post Number: 161 Registered: 5-2002 |
The one in my 78 came warped from being overtightened unevenly with 1 of the bolts on the tank snapped. It wasnt pretty.I made a custom ring to drop over the top of the sending unit and studs then reinstalled and tightened. got great even fit. | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 1882 Registered: 12-2000 |
Bruno, the sending unit is fairly stout, its the gas-tank that scares the hell-outta-me (screws are small and VERY fine thread into the aluminum tank...). General warning/advice: Pay attention to which side the float is on the arm (if you have the unit out and removed it). If you get it backwards, it jams in the tank and won't go up. Ask me how I know.... | ||
| Robert Rothschild (Rothschild)
New member Username: Rothschild Post Number: 13 Registered: 6-2002 |
thanks everyone, sounds to me like everything is operating as designed. Once again appreciate all the wise advice. | ||
| bruno bandaras (Originalsinner)
Junior Member Username: Originalsinner Post Number: 159 Registered: 5-2002 |
Dont damage that sending unit or tightan it back up uneven. THEY ARE EXPENSIVE. | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 2910 Registered: 2-2001 |
Sounds like Roberts system is functioning normally to me. | ||
| Ken Ross (Kdross)
Junior Member Username: Kdross Post Number: 65 Registered: 2-2002 |
My 1985 308 QV manual states that the tank holds 18.5 US gallons. The low fuel warning light (organe in color on my car) comes on at 1/8 tank. When I fill up the car at this point (1/8 tank) I usually put in about 14 gallons. Hope this helps. | ||
| Ben Lobenstein 90 TR (Benjet)
Member Username: Benjet Post Number: 678 Registered: 1-2001 |
Joe - Here we find the difference in Imperial Gallons and US Gallons (see the original post on this thread). My USA TR also has alot of pressure change when I open my fuel cap - and I have the carbon canister things. I drained my out my fuel some time ago to replace the fuel gauge sender, was ~30 USG to fill from dry. HTH. ok no more hijacking of threads- I promise (but my fingers are crossed)!! -Ben | ||
| F-J'87EuroTR (Ferrarijoe)
Junior Member Username: Ferrarijoe Post Number: 242 Registered: 5-2001 |
I do not mean to get off the subject, but since there are a couple of TR owners posting, I have a question for you. When I remove the filler cap to fill up the tank, every time there is a lot of + pressure released from the tanks. I have a Euro-spec TR and do not have the charcoal carbon canisters. The small hose goes behind the motor on the firewall and heads down by the right rear wheel well to a tank ventilation valve and a separate silencer in that order. I have to assume the ventilator valve should vent one way (out). However, is having the + pressure normal and if not, can it hamper the fuel delivery system? BTW. My owners manual states there is 115 litres (25 gallons) of fuel in the gas tanks to include a reserve of 18 litres (4 gallons). These figures are not correct because there are 3.7854 litres per US gallon. So, Ben is correct in saying there are 30 gallons. Joe | ||
| Michael N. (Man90tr)
Member Username: Man90tr Post Number: 536 Registered: 4-2001 |
Ben, I am not too sure that's correct. I am on vacation so I do not have my manual, but I think the US version of the TR holds 26 gallons and the light comes on at 1/8 full which is about 3.5 gallons remaining. Don't mean to contradict you just wondering which one is correct. | ||
| Steve (Steve)
Junior Member Username: Steve Post Number: 172 Registered: 2-2001 |
I find that if I'm at a 1/4 of a tank you will get the red light flickering when you turn rigt and the gas sloches to one side. The best thing to do is check the gage when driving on flat and level ground. I do about 240 miles before I get a solid red.Unfortunately Ferrari did not dampen the fuel tank reistat so the gage moves as the float moves. You get use to it after a while. Also for you folks with FI I would try not to let the tank get to low.Don't want to starve them injectors. | ||
| Robert Rothschild (Rothschild)
New member Username: Rothschild Post Number: 12 Registered: 6-2002 |
Great advice guys, to be honest i'm still getting used to her at this stage. Just filled up the other day and I;ll be sure to get more accurate readings to post on next fillup. Since the gauages appear to be somewhat finicky (normal) I've been filling up as soon as the redlight warning begins to flicker. This has usually occurred when the gauge reads somewhere between 1/4 and 1/2, not exactly sure since I've monitored the gauge while moving and it swings in 1/4 tank increments. I'd guess that we're probably talking about 1/3 of a tank at the time I've been filling up which almost always results in the gauge reading "nearly" 4/4, just a touch under full...can't quite get it to completely full no matter how much I top it off. I'd say on average I'm putting in roughly 10 gallons at each fillup which is getting me a respectable 210-225 miles before the next fillup, the MPG has been greater than I originally expected. The reserve capacity according to the workshop manual is ~4 US Gallons so if I add a few gallons to compensat for the fact that I'm filling up right when the light begins to flicker but is not constant, we're probably looking at about 6-7 gallons in reserve at fillup, so maybe 16-18 gallons total in the tank? sounds reasonably close to normal, what do you guys think? By the way Peter, thanks so much for the fantastic photos, really helped visualize the mechanism that causes the warning light to trigger, never realized that there would be a float swinging back and forth as the fuel sloshed from side to side, guess that explains the fluctuations in the gauge readings. | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 1879 Registered: 12-2000 |
I know this doesn't answer the question, but the way the low-level light is triggered, is within the sending unit rheostat, a second "finger" makes contact, thus switches on the light:   I figured once, it takes a little more than 15L to shut off the light (with the car sitting level and still). My manual too says capacity around 75L. | ||
| Ben Lobenstein 90 TR (Benjet)
Member Username: Benjet Post Number: 674 Registered: 1-2001 |
What are you judging nearly empty by? In my 30 US gal TR tank I get the warning light at 10 gals left. So each fillup is always ~20 gals. I've had them emptied/drained before so I know they will hold quite a bit more than the normal fillup, but that's just the way the system works. Hope that helps. | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 2900 Registered: 2-2001 |
If you are low on fuel so that the redlight warning comes on and you fill up,how many gallons does it take and where does your guage read? | ||
| Robert Rothschild (Rothschild)
New member Username: Rothschild Post Number: 11 Registered: 6-2002 |
everything I've researched points out that the standard capacity for the fuel tank on my 85 308QV is 74 liters or 16.3 imp.gallons or ~20 US Gallons. However each time I fill up, I'm hard pressed to squeeze any more than 10-11 gallons of fuel into a nearly empty tank. Any thoughts or am I just nuts? I know that there's a dual tank setup is it possible that air is trapped on one side and prevents me from completely topping of all 20 gallons? |