I've got an '86 Spider that was running fine now it won't start, it's not getting fuel. I took the fuel line off at the filter to see if fuel was getting through and it was. I put the line back on and it started. Next day it wouldn't start again. Took the line off at the fuel rail and it had good flow. Put line back on and it started. Next day it won't start, no fuel. Any ideas? Is there a possible vapor lock? Thanks for any help.