2000 5.3 silverado hard starting - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1986c10 · 11-23-2011, 08:42 PM

Hi, my buddy has 2000 chevy with a 5.3 185k miles on it that takes 4-5 seconds of cranking to get it started and it stumbles a tad then idles normal. He replaced the fuel pump and fuel filter. Starts up fine i guess when its cold but not good when its warm??? A person autozone said the fuel pump still could be bad... Anyone got any suggestions? were stumped haha. Thanks in advance.

**Clyde65** · 11-23-2011, 08:47 PM

Do you wait 2-5 seconds after the key is turned to the on position b4 starting? Fuel pump needs to push fuel to tb.
Maybe dirty fuel rail too
Posted via Mobile Device

1986c10 · 11-23-2011, 08:56 PM

Yeah it starts just as hard whether we prime it or not so im thinking its not the pump. Could we blead the fuel lines pop the rails off and just spray them down good with carb cleaner and blow them out?

usmcchevy · 11-23-2011, 09:56 PM

A bad new pump is possible, but check the fuel press regulator first. Its on the drivers side fuel rail. Pull the little hose off of the regulator, it there is any gas its bad.

1986c10 · 11-24-2011, 01:39 AM

Okay yeah we'll check that out cause someone previously had suggested that. Thanks!

Mr. 250r · 11-24-2011, 02:17 AM

Exactly how my dads 2000 suburban is except it has a whipple on it i've been wondering what it is though

Maxxd07 · 11-24-2011, 03:44 AM

Quote:

Originally Posted by usmcchevy

check the fuel press regulator first. Its on the drivers side fuel rail. Pull the little hose off of the regulator, it there is any gas its bad.

x2

1986c10 · 11-24-2011, 03:44 PM

one question on the regulator. If its bad and has gas in it, would that be when its running? off? or anytime? Thanks

usmcchevy · 11-24-2011, 04:56 PM

Anytime

**Boog** · 11-24-2011, 06:21 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=430723

85chevy383 · 11-24-2011, 06:29 PM

ive seen them do this from bad carbon build up in the throttle body... Just pull it off and use carb cleaner to clean the build up off and run like a champ, check engine light even turned off

1986c10 · 11-24-2011, 08:37 PM

lots of good info here. Okay so no gas came out of the hose but symptoms seem about the same as Boog's. Could the reg still be bad if gas doesnt come out?

**Boog** · 11-24-2011, 09:20 PM

Gas coming from the regulator is an indication the diaphram is broken. The spring inside could possibly be broken I suppose. I don't recall it being all that expensive and it is easy to change.
One other thing I want to mention is the vacumn line going to the regulator. Take the top cover off the engine and look that line over real good too. Mine had a crack in the rubber elbow at the regulator causing a loss of vacumn. A new one from GM was $28. A big rip. Next time I'll use a plain piece of vacumn hose for 19 cents.

usmcchevy · 11-24-2011, 10:56 PM

Quote:

Originally Posted by Boog

http://67-72chevytrucks.com/vboard/s...d.php?t=430723

Nice work Boog!

Cdshinne · 11-28-2011, 06:36 PM

I had this problem on my 2000 5.3 with the same hot and cold start symptoms. Everyone on this sight said fuel regulator, but i ignored it because it was replaced with a dealer fuel regulator a couple years ago when the problem first started, and the vacuum hose didn't have gas leaking out of it. Long story short I finally listened and bought another fuel regulator and it fired right up! 9 out of 10 times its your fuel regulator

1986c10 · 11-30-2011, 09:05 PM

Sounds like its definitely either the hose or regulator. I'll tell him to quit being a cheap ass and go buy them haha. Thanks guys

1986c10 · 01-03-2012, 04:52 PM

Sorry to bring up an old thread but to any who are wondering, it was indeed the fuel pressure regulator. took about 5 minutes to swap and the truck starts up great everytime now. Thanks everyone for the help

**Boog** · 01-03-2012, 10:19 PM

It's always good to hear back on what the fix was. Glad to help.

1986c10 · 01-04-2012, 11:25 PM

Thanks for the help boog

11-23-2011, 08:42 PM	#1
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	2000 5.3 silverado hard starting Hi, my buddy has 2000 chevy with a 5.3 185k miles on it that takes 4-5 seconds of cranking to get it started and it stumbles a tad then idles normal. He replaced the fuel pump and fuel filter. Starts up fine i guess when its cold but not good when its warm??? A person autozone said the fuel pump still could be bad... Anyone got any suggestions? were stumped haha. Thanks in advance. __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

11-23-2011, 08:47 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: 2000 5.3 silverado hard starting Do you wait 2-5 seconds after the key is turned to the on position b4 starting? Fuel pump needs to push fuel to tb. Maybe dirty fuel rail too Posted via Mobile Device __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

11-23-2011, 08:56 PM	#3
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting Yeah it starts just as hard whether we prime it or not so im thinking its not the pump. Could we blead the fuel lines pop the rails off and just spray them down good with carb cleaner and blow them out? __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

11-23-2011, 09:56 PM	#4
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: 2000 5.3 silverado hard starting A bad new pump is possible, but check the fuel press regulator first. Its on the drivers side fuel rail. Pull the little hose off of the regulator, it there is any gas its bad. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

11-24-2011, 01:39 AM	#5
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting Okay yeah we'll check that out cause someone previously had suggested that. Thanks! __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

11-24-2011, 02:17 AM	#6
Mr. 250r Registered User Join Date: Dec 2010 Location: freeburg, illinois Posts: 885	Re: 2000 5.3 silverado hard starting Exactly how my dads 2000 suburban is except it has a whipple on it i've been wondering what it is though __________________ 1987 Chevy V30 - http://67-72chevytrucks.com/vboard/s...d.php?t=573854 1988 IROC-Z Camaro - 305/T5 T-Top 1989 GMC V35 - Marbolo Express http://67-72chevytrucks.com/vboard/s...d.php?t=596850 1991 V2500 Suburban Silverado - Sold 1991 V2500 Suburban Scottsdale - Big Nasty http://67-72chevytrucks.com/vboard/s...d.php?t=497423 2001 Ram 3500 5.9 H.O NV56 EC DRW - Sold 2003 1500 Silverado 2004 Ram 3500 5.9 H.O NV56 CC DRW - Sold 2005 Silverado 2500HD 6.6/ZF6 CC LWB

11-24-2011, 03:44 PM	#8
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting one question on the regulator. If its bad and has gas in it, would that be when its running? off? or anytime? Thanks __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

11-24-2011, 04:56 PM	#9
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: 2000 5.3 silverado hard starting Anytime __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

11-24-2011, 06:21 PM	#10
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: 2000 5.3 silverado hard starting http://67-72chevytrucks.com/vboard/s...d.php?t=430723 __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-24-2011, 06:29 PM	#11
85chevy383 Registered User Join Date: Nov 2011 Location: Splendora Texas Posts: 87	Re: 2000 5.3 silverado hard starting ive seen them do this from bad carbon build up in the throttle body... Just pull it off and use carb cleaner to clean the build up off and run like a champ, check engine light even turned off

11-24-2011, 08:37 PM	#12
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting lots of good info here. Okay so no gas came out of the hose but symptoms seem about the same as Boog's. Could the reg still be bad if gas doesnt come out? __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

11-24-2011, 09:20 PM	#13
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: 2000 5.3 silverado hard starting Gas coming from the regulator is an indication the diaphram is broken. The spring inside could possibly be broken I suppose. I don't recall it being all that expensive and it is easy to change. One other thing I want to mention is the vacumn line going to the regulator. Take the top cover off the engine and look that line over real good too. Mine had a crack in the rubber elbow at the regulator causing a loss of vacumn. A new one from GM was $28. A big rip. Next time I'll use a plain piece of vacumn hose for 19 cents. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-28-2011, 06:36 PM	#15
Cdshinne Registered User Join Date: May 2009 Location: Kokomo, Indiana Posts: 79	Re: 2000 5.3 silverado hard starting I had this problem on my 2000 5.3 with the same hot and cold start symptoms. Everyone on this sight said fuel regulator, but i ignored it because it was replaced with a dealer fuel regulator a couple years ago when the problem first started, and the vacuum hose didn't have gas leaking out of it. Long story short I finally listened and bought another fuel regulator and it fired right up! 9 out of 10 times its your fuel regulator __________________ 1972 K20 lwb 2000 Z71 x-cab 1970 ford f100

11-30-2011, 09:05 PM	#16
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting Sounds like its definitely either the hose or regulator. I'll tell him to quit being a cheap ass and go buy them haha. Thanks guys __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

01-03-2012, 04:52 PM	#17
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting Sorry to bring up an old thread but to any who are wondering, it was indeed the fuel pressure regulator. took about 5 minutes to swap and the truck starts up great everytime now. Thanks everyone for the help __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold



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01-03-2012, 10:19 PM	#18
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: 2000 5.3 silverado hard starting It's always good to hear back on what the fix was. Glad to help. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

01-04-2012, 11:25 PM	#19
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: 2000 5.3 silverado hard starting Thanks for the help boog __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

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