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Username Post: Long cranking time. Hard start        (Topic#230127)
boogie 
Senior Member
Posts: 2145
boogie
Loc: Louisiana
Reg: 07-11-02
11-21-09 04:46 PM - Post#1809888    

2006 Suburban 5.3 turns over awhile before starting up. Runs fine once started. I do not see a fuel pressure regulator nor do I see one listed at Rock auto parts. Pressure is 60psi running. I noticed the fuel pressure drops very quickly to zero when you kill the engine...don,t know if this is normal or not. Anyone have a clue what the problem is?
'85 GMC C1500 SWB 355 sbc


 
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black95jimmy 
"7th Year" Silver Supporting Member
Posts: 8738
black95jimmy
Age: 63
Loc: Venice, FL
Reg: 01-05-02
11-21-09 06:26 PM - Post#1809957    
    In response to boogie

  • Quote:
When an engine cranks for a long time before it starts, either spark or fuel is missing or weak and each has its own reasons. Most of the time, the air / fuel mixture has been disturbed and there is too much air or not enough fuel. Many sensors report to the computer, who then takes that input and controls fuel or air delivery, is suspect when diagnosing long cranking times. A bad coolant sensor, a bad throttle position sensor (TPS), a bad fuel pump or a plugged fuel filter can all cause a lean condition causing long cranking times. Sometimes the spark is delivered late, weak or not at all. A weak coil or bad coil wire, a bad pick up coil or crank sensor or a bad rotor can all cause a change in the spark.

If you know when it will not immediately start, try spraying carb cleaner or starting fluid in the duct that carries air to the air filter. If by adding "fuel" the engine always starts faster and cranks over less, then you will know it’s a fuel delivery problem and can pass on to your tech, the process you used and the results.



82 Monte Carlo SC, 355 w/Vortec heads, roller rockers, 670 Street Avenger, Pypes true duals.
2000 Sub.5.3L 40 Gallons of gas @ $3.00/gal. bla bla bla.


 
boogie 
Senior Member
Posts: 2145
boogie
Loc: Louisiana
Reg: 07-11-02
11-21-09 07:45 PM - Post#1810027    
    In response to black95jimmy

I am pretty sure it is a fuel issue. Fuel pressure is bleeding off to nothing in less than 5 seconds after turning the ignition off.

Watching the fuel pressure guage shows the pressure slowly climbing from zero while cranking until it gets to sufficient pressure to let the engine run.

I just need to know how the pressure is bleeding off. Bad check valve in the pump? Is the regulator part of the pump module?

'85 GMC C1500 SWB 355 sbc


 
86chevy350 
Forum Newbie
Posts: 5
86chevy350
Reg: 11-21-09
11-21-09 08:12 PM - Post#1810049    
    In response to boogie

try to cycle the key on and off like 5 times then the 6th time start it. see if it starts easer like that. if so its not holing the fuel pressure in the line.

 
boogie 
Senior Member
Posts: 2145
boogie
Loc: Louisiana
Reg: 07-11-02
11-22-09 06:26 AM - Post#1810212    
    In response to 86chevy350

  • 86chevy350 Said:
try to cycle the key on and off like 5 times then the 6th time start it. see if it starts easer like that. if so its not holing the fuel pressure in the line.



Yes sir,I have confirmed this. I just need to know what needs to be replaced so the fuel rail will stay pressurized.
'85 GMC C1500 SWB 355 sbc


 
DEI8FAN 
Member
Posts: 674
DEI8FAN
Age: 55
Loc: Western, N. Carolina
Reg: 02-01-05
11-22-09 06:32 AM - Post#1810214    
    In response to boogie

The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times.

This is from Alldata
1959 El Camino
1970 El Camino
1981 Corvette
2004 Z71
2005 Monte Carlo


 
boogie 
Senior Member
Posts: 2145
boogie
Loc: Louisiana
Reg: 07-11-02
11-22-09 06:44 AM - Post#1810220    
    In response to DEI8FAN

That's what I was looking for! I figured the regulator had to be part of the fuel pump module since I could not find one under the hood anywhere.

Thank you very much!
'85 GMC C1500 SWB 355 sbc


 
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