It would depend on the environmental conditions that the shelf experiences. Cool and dry - Good. Hot and moist - probably not so good.
You'd probably have to pull the fuel pump apart and look at the condition of the diaphragm. If it's cracked, it would need to be replaced.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.