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Username Post: Early Sign of A Fuel Pump Going Bad??        (Topic#176960)
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-12-07 10:15 AM - Post#1316800    

My 99 GMC Sierra Z71, 5.3 has been a little tough to start the past couple weeks. I haven't been driving it hardly at all, for the past 9 months, but with the crappy weather, I've started to again. That said, when I start it cold in the morning, or after it sits all day at work, it takes a little longer to get it to start than normal. It always starts, but just takes maybe a second or so longer to start. Would the fuel pump be starting to go bad or does it just go from working to not and that's it?

Thanks in advance.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
elcamino 
Valued Contributor
Posts: 4940
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
12-12-07 10:21 AM - Post#1316806    
    In response to Husker Z

From all accounts I have heard there is no early sign, they just die one day and the truck will not start.
Mike
2009 Cadillac CTS4 AWD Performance Sedan
2012 GMC Sierra AWD Denali 6.2L


 
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-12-07 10:25 AM - Post#1316809    
    In response to elcamino

That's kind of what I was wondering. Well, what the heck would give me a slow start like that? Seems like it's just waiting for fuel. It turns over at the normal speed, it just hesitates before starting.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
Squasher 
Very Senior Member
Posts: 1726
Squasher
Loc: Northern California
Reg: 07-05-02
12-12-07 01:24 PM - Post#1316927    
    In response to Husker Z

  • Husker Z Said:
That's kind of what I was wondering. Well, what the heck would give me a slow start like that? Seems like it's just waiting for fuel. It turns over at the normal speed, it just hesitates before starting.




I think it's something to do with a presure relief valve sticking open. Before you start your truck, turn on the ignition to ON but dont start. wait 10 to 15 seconds. Turn OFF then ON and start the truck. If it works, it's may be that presure valve. I think the presure valve is on the pump itself, but I dont know for sure.
2001 GMC Sierra K1500 Z71 x/cab SLT 5.3L


 
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-12-07 01:56 PM - Post#1316959    
    In response to Squasher

Is that pressure relief valve part of the pump itself? If I replaced the pump, would that include the valve? Just curious.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
Bad Bowtie 
Senior Member
Posts: 4469
Bad Bowtie
Age: 41
Loc: TX
Reg: 07-04-03
12-12-07 02:12 PM - Post#1316972    
    In response to Husker Z

Have u changed ur fuel filter in the last 12 months/12k? I would also clean ur mass air flow sensor and IAC valve on the throttle body. A can of Seafoam fuel treatment in the gas tank would be a great follow-up as well...
GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
Squasher 
Very Senior Member
Posts: 1726
Squasher
Loc: Northern California
Reg: 07-05-02
12-12-07 02:23 PM - Post#1316979    
    In response to Husker Z

  • Husker Z Said:
Is that pressure relief valve part of the pump itself? If I replaced the pump, would that include the valve? Just curious.



I dont know, But I think it was part of the pump assebly. Mine pump was replaced under warrenty for the same problem. Or thats what they told me they did
2001 GMC Sierra K1500 Z71 x/cab SLT 5.3L


 
2003YukonXL 
Senior Member
Posts: 1467
2003YukonXL
Age: 34
Loc: Sumter, SC
Reg: 04-03-04
12-12-07 09:26 PM - Post#1317304    
    In response to Squasher

I blame the pressure regulator for a lot of fuel related problems on these trucks. if there's gas in the vacuum line, it's bad.
Jake Brodersen
2006 Ford Explorer XLT 2WD (The Wife's)
2005 Pontiac GTO 6MT (My Toy)
2003 GMC Yukon XL SLT 4WD (The Family Hauler)


 
wagonman100 
Super Senior Member
Posts: 13525
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
12-13-07 05:16 AM - Post#1317421    
    In response to 2003YukonXL

Pumps sometimes start to whine before they go up, but not always.
Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
Erich2087 
Senior Member
Posts: 193
Erich2087
Reg: 10-06-03
12-13-07 06:03 AM - Post#1317439    
    In response to Husker Z

Check the fuel pressure regulator for a diaphragm leak (fuel in the vacuum line). Change fuel filter if due.

If the regulator is fine, place a fuel pressure tester on the fuel rail schrader valve and cycle the ignition several times without starting the engine. (Follow all safety rules for this procedure). Normal reading should be 52-60 psi and eventually hold 6 psi in a few minutes and stay overnight.

My readings went from 58 psi to 0 psi in less than 30 seconds. It did not hold the factory spec of 6 psi in the system.

A bad fuel pump relief valve will empty the fuel rails over night (sometimes when hot), resulting a hard start the first time, and a start with the second/third attempt.

Only a fuel pump replacement will change this condition.

Eric
1990 5.7 Silverado C-1500

2001 5.3 Silverado LT


 
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-13-07 07:19 AM - Post#1317484    
    In response to Erich2087

Well, it hasn't failed me yet, so I guess I'll just keep an eye on it and see what happens. This morning it actually sat outside in the cold for the first time in the 4 years I've had it and it started just fine. Maybe it doesn't like the warm, comfortable garage.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
toms94 
Member
Posts: 85
toms94
Loc: Kansas
Reg: 10-27-04
12-13-07 10:18 AM - Post#1317597    
    In response to 2003YukonXL

I just had this problem with my 99 Silverado.....it was the Fuel Pressure Regulator. Took about 5 minutes to fix it. (and about $70 at my local parts store)

Just like was said above, pull the vacuum line off the FPR, gas ran out of mine (not good), if it smells like fuel or fuel runs out, the FPR needs to be replaced.

I'm betting this is your problem.

I see you're in KC, I'll be in KC this weekend, if you need help maybe we can get together and see if we can fix it.
2001 Corvette Mag Red Coupe Corsa/Haltech Custom MidAmerica Motorworks Mag Red/Light Oak Seat covers.
2009 Silverado 1500 LTZ Crew Cab Z-71 Volant CAI

[IMG]http://img.photobucket.com/albums/v281/toms94/Co rvette/2010/Cruisefest201 0101-1.jpg[/IMG]


Edited by toms94 on 12-13-07 10:19 AM. Reason for edit: No reason given.

 
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-13-07 11:38 AM - Post#1317656    
    In response to toms94

Thanks guys, I'll keep an eye on it for a while.

Tom, I'd love to work on my pickup this weekend, but we have two birthday parties and a Christmas party. Can't wait, let me tell you.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-18-07 07:24 AM - Post#1321302    
    In response to Squasher

  • Squasher Said:
  • Husker Z Said:
That's kind of what I was wondering. Well, what the heck would give me a slow start like that? Seems like it's just waiting for fuel. It turns over at the normal speed, it just hesitates before starting.




I think it's something to do with a presure relief valve sticking open. Before you start your truck, turn on the ignition to ON but dont start. wait 10 to 15 seconds. Turn OFF then ON and start the truck. If it works, it's may be that presure valve. I think the presure valve is on the pump itself, but I dont know for sure.



Well, I did that this morning and sure enough, it started right up. So, is the pressure relief valve the same as the pressure regulator as mentioned also? If so, the poster said it took him 5 minutes to replace it, but I can't imagine getting to and replacing anything on the fuel pump itself in that amount of time. Anyone clear up what I need to replace and where it is?

Thanks again.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
Squasher 
Very Senior Member
Posts: 1726
Squasher
Loc: Northern California
Reg: 07-05-02
12-18-07 08:51 PM - Post#1321908    
    In response to Husker Z

  • Husker Z Said:
  • Squasher Said:
  • Husker Z Said:
That's kind of what I was wondering. Well, what the heck would give me a slow start like that? Seems like it's just waiting for fuel. It turns over at the normal speed, it just hesitates before starting.




I think it's something to do with a presure relief valve sticking open. Before you start your truck, turn on the ignition to ON but dont start. wait 10 to 15 seconds. Turn OFF then ON and start the truck. If it works, it's may be that presure valve. I think the presure valve is on the pump itself, but I dont know for sure.



Well, I did that this morning and sure enough, it started right up. So, is the pressure relief valve the same as the pressure regulator as mentioned also? If so, the poster said it took him 5 minutes to replace it, but I can't imagine getting to and replacing anything on the fuel pump itself in that amount of time. Anyone clear up what I need to replace and where it is?

Thanks again.





The relief valve (check valve) is in/on the fuel pump in the tank.

I dont know if it causes any other problems becides hard starting.
2001 GMC Sierra K1500 Z71 x/cab SLT 5.3L


 
toms94 
Member
Posts: 85
toms94
Loc: Kansas
Reg: 10-27-04
12-19-07 07:55 PM - Post#1322742    
    In response to Squasher

No they must be different things. The Fuel Pressure Regulator is on the fuel rail (drivers side) right about in the middle. Have you checked to see if it smells like or has fuel in the vacuum line attached to it?
2001 Corvette Mag Red Coupe Corsa/Haltech Custom MidAmerica Motorworks Mag Red/Light Oak Seat covers.
2009 Silverado 1500 LTZ Crew Cab Z-71 Volant CAI

[IMG]http://img.photobucket.com/albums/v281/toms94/Co rvette/2010/Cruisefest201 0101-1.jpg[/IMG]


 
Husker Z 
Senior Member
Posts: 276
Husker Z
Loc: Kansas City
Reg: 05-11-04
12-20-07 06:53 AM - Post#1322978    
    In response to toms94

I haven't checked that yet, I simply performed that test where you turn the key to on for 15 seconds.
"Welcome to Nebraska, You'll Never Lose to a Nicer Place"


 
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