My blazer wont start unless I spray carb cleaner in the carb.I've read that u need 60 psi to start but mine only has 50 to 55 key on engine off.It has a new fuel filter so dose that mean I just need to replace the pump? btw once I get it started it runs fine and useully will start again but not after sitting all night.

Please help. It would be greatly appreciated. Thanks a lot!

-Andy

 

check the spark on the plugs remove a wire put a old plug in the end of the wire and have someone turn the engine over you should have a pretty blue spark not a yellow one blue is a strong fire spark and yellow is a weak one this will help narrow it down also the pump should have a constant pressure with no leak downs leave the gage on and in the morning see if it leaked down the pump may be bad like you suggested.