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Search Auto Parts Search 2000 chevy truck slow initial start Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting Fournbr3 User May 24, 2011, 12:50 PM Post #1 of 5 (4626 views) 2000 chevy truck slow initial start Sign In Hey guys, 2000 Chevrolet truck, 5.3 engine. Truck does not want to start in the mornings, spins over more than usual. After turning key off/on 2 or 3 times it starts better. I can hear the fuel pump run for its initial 2 seconds. I then put a fuel pressure gauge on. On the first try it went to about 45 psi. Second time about 58 and goes no higher than that. It also leaks down faster than I think it should, about 1 psi per second. I then clamped off the return line and checked the pressure and I got the same result. After troubleshooting the truck started right up, but normally you have to "wind it up" in order for it to start like it used to. Truck has a little over 110k miles. The fuel regulator hose is dry but I don't think this should affect initial startup. Any other way for me to check regulator, pump or checkvalve? Hammer Time Ultimate Carjunky / Moderator May 24, 2011, 1:23 PM Post #2 of 5 (4618 views) Re: 2000 chevy truck slow initial start Sign In Yes, that is leaking down too fast. Did you try pinching off the feed link before the gauge once you build pressure? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Fournbr3 User May 24, 2011, 7:25 PM Post #3 of 5 (4605 views) Re: 2000 chevy truck slow initial start Sign In Thanks, No I thought about that later, so you say just to let it build pressure and then pinch off BOTH lines? That would seem to point to a leak in the injector area somewhere, but that would seem odd as once the truck starts it runs great. Its just after sitting for a while, especially overnight that it has the problem. I see a lot of leaking regulators, and fuel pump/checkvalve problems and I'm trying to diagnose it correctly. Also what should the pressure be on that truck? I thought 58 (with good flow also) was OK as it would be a little higher if something wasn't leaking...THANKS! Hammer Time Ultimate Carjunky / Moderator May 24, 2011, 7:32 PM Post #4 of 5 (4601 views) Re: 2000 chevy truck slow initial start Sign In No, I'm saying now that it passed on the return line test, run the same test on the feed line to find out if it's leaking back through the fuel pump check valve. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Fournbr3 User May 25, 2011, 7:15 AM Post #5 of 5 (4593 views) Re: 2000 chevy truck slow initial start Sign In OK , Gotcha, I'll get that accomplished and get back to you, Thanks.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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