Jay, Depending on which fuel pump you have. The Bosch catalog shows the De Lorean to use a 0-580-254-984, this has a long neck and has the check valve built into it. The pump that I sell and just about everyone uses is the same # except the last three digits is 957. This 957 pump has a shorter neck as shown on my web site. The check valve is just screwed on and easily replaced. Unless I'm misintrepeting something it's that easy. A real simple test is to take it off hold a air hose on it and try to open it. I turn the air tank pressure down to 40 to 50 lb's. I will post a long neck on the site in a few days to show the difference. Could you have a lower pressure pump. John Hervey www.specialtauto.com --- In dmcnews@xxxx, badgeman46@xxxx wrote: > Pardon My ignorance when it comes to fuel systems, but is it > possible to service just the check valve on the fuel pump? Or replace > the fuel pump altogether. My car is hard to hot start, yet I have a > new accumulator in it, so I think it is losing fuel pressure out of > the check valve. Any other suggestions? Thanks. > -Jay