Quote:
Originally Posted by jhu321
sorry to bring up old thread, i'm chasing the same thing.. i thought i had a fuel injector leak because on cold start only i would see the fuel pump pressure start at 6.9 and over a period of 5 minutes drop to 5.9... but after the car has been running and warmed up and i do a stop and then start again, it'll hold 6.9 and actually increase to 7.2.
with that i assumed my check valve was okay and it was thermal related so i concluded it was my injectors. however after replacing my injectors its still doing the same thing... so i'm thinking its check valve now? were you successful with your check valve replacement? thanks
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Did you ever fix this? Also chasing a similar issue. I noticed it after changing injectors, but then realized my fuel rail hoses were leaking. After then changing that and then changing o rings on injectors it seems to still be happening albeit under slightly different conditions. It sseems to only leakdown pressure after cars hot and initially after shutoff and reprime it holds pressure really well until about 1 hour after shutoff in which it bleeds down to 0 in a few hours. If i restart it seems to run fine and doesnt seem like injectors , as they are also new. They for sure dont leak when its cold.