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· Opeler
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I'm not sure if this helps, but I used to own a Kadett Wagon of the same year and the fuel pump constantly vapour locked. (Nothing that 45 minutes standing around waiting for it to cool off wouldn't cure..). I ended up bypassing the OEM pump with an external electric pump.

If you want to test fuel flow rate, why not disconnect a fuel line and measuring volume during a cranking test. (and now a few words about shop safety..) I suspect that if fuel flow for the 1.5 fuel pump is of lesser capacity than the 1.9, it may only be an issue during sustained full throttle conditions, an unlikely scenario for a collector car. btw, the 1.9 OEM fuel pump part number in 1971 was G816030.

Tom
 
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