The spill ring I made for the hybrid pump did not have tight enough clearance on the plunger shaft

. It ran fine , but when the engine was fully warmed up , the fuel in the pump is hot and thin , and it was hard to start . After some research on the internet , it dawned on me what the problem was . So I made a new spill ring that fit tighter . It now starts by just bumping the key , idles smoother , has more power , and my egt's are lower . I don't think any of this info will help out with an electronic pump , though . If you have too much clearance between your plunger and distributive head bushing [ bore ] . You would have similar problems . You would also have hard starting when hot , though . I would really like to see a photo of the exhaust !