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Fuel Lines

Guzzi850T3

Just got it firing!
Joined
Mar 4, 2009
Messages
10
Location
Adelaide
Hi All

Need to replace my fuel lines on my 1975 T3 which have clear lines currently. The lines are large to say the least! What size and type has the most success? The lines are connected in a crossover fashion but have been told the best solution is left line straight to right carb and right to left carb and NO crossover? What is the conciseness as to what is best? Anyone know why there is a crossover arrangement?? Looking forward to your thoughts on this, so thanks in advance.
 
Instead of the crossover I use a metal double inlet banjo on each carb- if you have plastic ones you should replace them as they tend to snap.

MG cycle do a very nice clear blue 5/16 poly line - excellent stuff that does not harden like vinyl etc.
 
Yup, the double banjo fuel spigots...

I have used this set up for many Guzzis.. just installed the same on a friend's SP last night, great choice IMO.

7890.jpg



And 7mm braided fuel line... Excellent stuff, no clamps required.

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Just as an FYI though, when you use this hose you will need to put the hose on the spigot first on the leg that is nearest the carb body, then put the spigot on the carb, depending on how you route the tap, the hose is thick and trying to put it on after is futile... You will see what I mean when you start to install the banjo and discern the correct angle for both the feed side and the balance side.

The crossover is for balancing the fuel from side to side... You can actually run just one fuel tap /petcock that way if you like but run both for best volume of fuel delivery.

Best,
Rob
 
Another vote for double metal banjos, which I always run with both taps open on my 78 T3. I too use the 7mm braided black stuff, though I use hose clamps too, well, just because the hoses could split up at the top, & why not. You may have to experiment a bit with banjo positioning & hose routing depending on specifics of your bike.
 
FWIW, what Guzzi was intending with the crossover was to run it off the right petcock only. That left the left petcock as a reserve. When the engine starts to miss, just reach down and turn on the left petcock, no need to remove your hand from the throttle, and you have better than a gallon in reserve.
 
The petcocks each have a reserve position. Just as easy to swith from on to reserve as from off to on. And after all, T3 has 6 useable gallons fuel capacity. How much do you need?
 
The early Guzzis didn't have a reserve on the petcocks, just on and off. That's what the crossover was all about. Naturally, since they still had a barrel full of crossovers, they kept using them after they started using petcocks with reserve. :) I think they're still using stuff from WW2 Fiat fighters..
They still used the electric fuel petcock for years after they went to fuel injection. No reason to shut off the fuel on those. <shrug>
 
OK if you say so, though we're talking about a T3 here, which does have a reserve, & if I recall correctly my Eldo did too, so you must be talking REAL early....

Also, if one side of the tank/petcock runs out of fuel before the other, which would seem to be pretty possible, both carbs still get fuel with a crossover, but not without.
 
I was just saying where the crossover came from. It was standard on the V700, which had petcocks that were only on or off. That's the way the reserve worked. In typical Guzzi fashion, however, they never got rid of it when it was no longer needed.:laugh:
 
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