Another Starting Symptom Question
 

OK...'91 300E again here...replaced fuel acccumulator and car starts on first time almost everytime. However, on the occasions where it doesn't start on first crank, for some reason, I have to long crank it and give it gas until it starts. What could be causing this? Check valve? Leaky injectors? EHA? I noticed that my daughter's '87 300E has a much stronger crank when you turn the key and mine seems weak...could battery amperage come into play? Hers is older, more miles, and starts right up STRONG!