Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
Fuel lines.
I'm betting you have an air leak, the pump is sucking air which compounds vapor locking.
I have seen some bad "replacement" ignitor unit coils turning up, but what you described sounds like the pump is sucking a little too much wind.