Accelerator pump

[Dltarnnr]

Summit racing rebuilt holley 1920.She runs good in park but not in drive it cuts out.
Noticed there is only one spring which is on side of
Pump diaphragm that hooks onto pump lever.There
is no pump return spring between the diaphragm and the
main well!Could this be why it cuts out?

 

[Meep-Meep]

If you have a good strong shot of fuel when you move the throttle, and it repeats, then you probably don't have an accel pump problem. Where did you hook your distributor vacuum advance to? Should be on the ported port (not manifold vacuum). Check your timing curve to see you are getting proper advance.