My info says the pressure shouldn't drop more than 5 psi in 10 minutes. If drop is excessive, you can block off supply and return, one at a time, see if pressure holds. I forgot to look, if you have a return line?

Answered by JDL (expert)
14,455 answers provided

I will try restricting the return line and monitor pressure. Do you have any insight or info regarding why it woud start ok after sitting over night. Even when it is a hard start issue, fuel pressure is w/ in spec. Also if I shut it off and crank it again w/ in a few seconds it stats ok, but if it sits for more than 5-10 minutes or longer it becomesa hards start. Do you think the Ign module could cause this? The Ign coil has been replaced the cap/rotor has been checked. (performed a tune up last year). I'm just not 100% sure on testing the Ign Module.

Response from markgmurray
1 question asked

Does the pressure drop faster than the spec listed. A hot restart issue could be caused by a flood issue?

Answered by JDL (expert)
14,455 answers provided

With the key on engine off the pressure will quickly go to about 60 psi then drop quickly about 5 psi when the regulator opens (I'm assuming). After that the pressure will continue to drop to 0 psi with in a minute or two. It's odd that it if you shut it off for only a second or two and crank, it will start ok, but if you let it sit for 5 - 10 minutes or longer it becomes an issue. Also it starts ok if it sits overnight cold.

Thanks
-Mark

Response from markgmurray
1 question asked