Fuel tank replacement Spica Carb issue - Alfa Romeo Bulletin Board & Forums
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post #1 of 5 (permalink) Old 06-02-2019, 11:28 AM Thread Starter
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Fuel tank replacement Spica Carb issue

Ugh.

Thought this would be an easy R&R, but no such luck. I bought a new carb'd tank and fuel sender for my '74 Spider 2000 from Classic Alfa. Upon removal, I discovered the OLD tank has a lower outlet, upper inlet and a small breather tube which was all connected up. I'm thinking the car was converted from Spica now that I've been poking around.

My new tank and sender unit only has the outlet from the sender. I have no idea where the upper "return" line from the old tank should go now. Looking in the engine bay, there is only one fuel line going to the webers, so I'm not sure where the return line would be looped in, but it was full of gas when I removed the old tank.

Ugh. Wanted this job done today but no such luck. Any thoughts here on fixing my setup? Can I kill the return line (any idea where it might go)?

Thanks,
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post #2 of 5 (permalink) Old 06-02-2019, 02:12 PM
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You don't need a return line if you are using Webers. Use a low pressure pump and a Filter King regulator set to 3 psi.
Be aware that some pumps have difficulty pulling fuel from the top of the tank. I have found a Carter P4070 pump to be very reliable. Install the pump at the lowest practical place that is close to the tank.
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Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #3 of 5 (permalink) Old 06-02-2019, 06:00 PM Thread Starter
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Yes

make sense, and long term is the best solution. I only wonder why the "old" return line was still full of fuel. Where are these things typically teed together?

A quick glance has the existing fuel pump as a square thing. Guessing this is the old FI pump, and the return line is being used to drop the pressure?
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post #4 of 5 (permalink) Old 06-02-2019, 07:48 PM
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The cube pumps are cheap and cheerful. Some people have good experiences with them but I didn't.
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Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #5 of 5 (permalink) Old 06-16-2019, 05:02 PM Thread Starter
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Super helpful, thanks.

Swap done. All the return and ventilation lines were chopped under the car. New tank, filter, pump and fuel lines happily installed!
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