Strange noise at start up.

[tcbkelly]

Hey guys, looking for a bit of insight. I have a 2000 f250 4x4 PSD with 258k miles. When I start the truck it sounds like it has no oil in it and then it quiets down after about 5-10 seconds of running. I have good oil pressure and I just had it changed. I do have a very strong fuel smell after driving, so I know I have a fuel leak. I'm ordering the O ring kit for the separator tomorrow. also sometimes when I start it, the rpm's bounce like its going to die, then it levels off.

any ideas?

[countryraised]

HPOP reservoir could be leaking down, your LPOP has to refill the reservoir for the injectors to have enough oil to function properly. or HPOP is getting weak?

[tcbkelly]

Oh yeah, the truck does have a minor oil leak. I had the dealer fix it about 100k miles ago but it might be time to replace the hpop O rings again...