jlglr4
Full Access Member
A small leak in the check valve (maybe only in one of the pumps) that‘s draining pressure off while turned off might not make much difference in the performance of the pump when running. Wondering if you’ve compared fuel pressure before a normal start to fuel pressure before it does the long crank. If there are situations when you’re pretty sure the engine will start quickly, like maybe setting for only 30 minutes or an hour, you could compare the pre-crank fuel pressure with what you see after sitting overnight. Might give you some clue about whether fuel pressure is really the issue. If it’s 50 psi after setting for 2 hours, but still starts up quickly - maybe its not a fuel pressure issue.
You might also do a little research and see if there is a way to crack the fuel lines and pressurize them - see if they hold pressure. Maybe test the right rail, left rail, and then feed line back to the pump separately. Perhaps a garage would have a way to test for injector leak without having to pull the injectors.
You might also do a little research and see if there is a way to crack the fuel lines and pressurize them - see if they hold pressure. Maybe test the right rail, left rail, and then feed line back to the pump separately. Perhaps a garage would have a way to test for injector leak without having to pull the injectors.