Ferrari 246 Dino GT Aux Fuel Pump | eBay Listed as a fuel pump? Where does it go? What does it do? What models is it used on? Presumably some smog part - so a USA / California car?? Thanks F-chatters.
pretty sure it is either a bereather or a filter...i have one on the rear bulkhead where the fuel line is attached to the frame...i have one on my 74 usa gts but not on my euro 71 gt...maybe its a usa pollution deal but that is what it is
Simplest thing to do is look at your Spare Parts Catalogue for the Fuel Pump Fuel Delivery page. It's not used on my Dino (71 euro GT) and doesn't show in my Parts Catalogue. But USA and/or E series fuel delivery systems have different bits than early Dino's (eg, fuel pump, fuel filter, etc). Looks like #8 on TAV49 Fuel System (Variants for USA Versions) (dwg found on several parts sites that include parts dwgs). Image Unavailable, Please Login
Don't have that book...you just need to know what parts web sites to search TRutlands: 103686 ONE WAY(ROLLOVER)FUEL VLV. McCann's: 103686 FUEL VAPOR VALVE UNION, US VERSION 246 DINO/308GT4/308GTB/S (OLD # 820938 & 4226204)
It is a smog part and the same as fitted to a 308. They are not hard or expensive to get and can be removed without adverse reactions. Remember that even in California the newest Dino is exempt from all smog concerns.
ANTIEVAPORATIVE EMISSION CONTROL SYSTEM (VARIANTS FOR USA - AUS AND J VERSION) I don't think it's a rollover valve 'cause it doesn't appear to have a moving part in it - like a weight to sense position.
Does not mention valve, Two lines in, nothing out. maybe it just a collects vapor from the fuel pumps and then then gives it back.
Is it OK to block this whole setup off? It's not used on the euro version. I'd like to leave it in place but deactivate it. I'm thinking you could block tube #7 and #13 in the diagram and that would do the trick.
Yes, someone does. Well, more or less. It is a three-way diverter valve. It is described in this thread: http://www.ferrarichat.com/forum/206-246/354420-differences-between-us-non-us-dinos.html Covered in section 12, post #6. Quote: "12. Fuel system. (Evaporative emission system) A fuel/vapor separator (17) on the right tank, leads the fuel vapor through a three-way valve (8) into an activated carbon canister (12). Hot air is led into the canister, and engine vacuum purges the canister. The three-way valve is there to maintain a slight pressure in the tank. It lets air in to prevent vacuum in the tank, and it also serves as an emergency release valve, preventing excessive pressure build-up in the tank."
Not pretending to be an expert on this, but yes, it seems to me that you could bypass this whole setup by closing those two hoses. But then, you would have to open another vent for the gas tanks into the atmosphere, as on the Euro cars. Not so sure if that would be desirable or recommendable, though.
The operation of the 3-way valve (8) is well described in text and figures on pages O14 and O15 in the 308GT4 WSM.
in my book its called a " valvola a tre vie" (a three way valve) #8 tavola 49 "mechanical groups for USA" section 103686, 605-820938
