[Vettezuki]

The one buck truck, GMC 1500 w/5L, runs ok once it is started, and then for the rest of the day. But it is a bitch to get started in the morning. It takes like maybe ten attempts before it will finally turn. At the beginning of each crank it sounds like it wants to start right up, but then the engine just turns. If I put starter fluid, which is a little tedious because you have to take off the TB bonnet, it fires right up, so I'm guessing this is some kind of fuel issue. The filter is relatively new. Plugs, wires, and ignition control module is all new(ish). What say ye?

[Damian]

Sounds like your FPR or pump is leaking by and the pressure drops to nothing. Try turning the key to the on position and let the pump run for a few seconds, then start it up.

[Vettezuki]

Originally Posted by Damian

. . .Try turning the key to the on position and let the pump run for a few seconds, then start it up.

I'll try that again, but AIR, doesn't help. Thanks for the input. Wonder if it's just a somewhat weak pump?

[Damian]

It just sounds like it has to build up fuel pressure before it will start. Could be a weak fuel pump as well.

[94cobra69ss396]

Try turning the keep a few times before attempting to start it. Every time you turn the key the injectors squirt fuel.

[kdracer73]

The pump assembly has plastic lines from from the pump to the pump mount. They can get pinholes that bleed down after shut off, and take a while to build pressure back up. The hole might not be big enough to keep it from running, but will cause long crank times... If it has the sequential injection, the pressure regulator can leak also, but it could cause rough running-hot start issues , since the fuel leaks into the manifold... Are you going to be home Sunday? I am at Frankie's and can swing by...

[Vettezuki]

Yes. I'll be home. Let me when is convenient for you. It is a TBI motor

[kdracer73]

Data base Search on Identifix........



Extended crank 50 PSI fuel pressure



Average Reported Mileage:


132500



Tests/Procedures:



1. Check the fuel filter.

2. Check the fuel pump power/ground, Gray and Black wires.

3. If OK, replace the fuel pump.



Tech Tips:



Fuel pressure needs to be 60-66 PSI while cranking










1997 Blazer 4.3

1997 K1500 5.7



1997 C1500 5.0

1998 K1500 5.7



1997 S10 4.3

1993 Safari 4.3



1993 S10 Blazer 4.3

1999 Yukon 5.7



1998 Jimmy 4.3





Customer Concern:



Engine is starting hard. If alternate fuel is added, it will start right up.



Average Reported Mileage:


176294



Tests/Procedures:



1. Check fuel pressure while cranking. It has to be 60-66 PSI while cranking the engine over.

2. Check for power and ground to the fuel pump.

3. Try blocking the return line and see if the pressure goes higher or stays the same.



Author:


Christopher Pittman





















Potential Causes





With OEM Direct diagrams, components, TSBs, and R&R procedures







Weak Fuel Pump








Malfunctioning Fuel Pump Ground Supply








Malfunctioning Fuel Pump Power Supply















Confirmed Fix Summary





With OEM Direct diagrams, components, TSBs, and R&R procedures






Confirmed Fix


9 - Fuel Pump








3 - Fuel Filter, Fuel Pump








1 - Battery Cable Terminal(s), Battery Terminal Bolt















Confirmed Fix Details











Tech



Reported Fix Details



Confirmed Fix


Dan Tepolt
October 05, 2013



1999 GMC Yukon, Denali 5.7L, V8, Gas, Asp N, VIN R, USA *
Fuel Pump
114,000 miles

Fuel Pump



Victor Arrington
August 14, 2013



1993 Chevrolet S10 Blazer, Tahoe 4.3L, V6, VIN W, USA *
Fuel Pump
175,650 miles

Fuel Pump



Allan Clare
August 10, 2012



1997 Chevrolet Blazer, LT 4.3L, V6, VIN W, USA *
Fuel Pump
- Bad fuel pump fixed it THANKS

Fuel Pump



BSRO Technician
August 28, 2011



1997 Chevrolet Blazer, LT 4.3L, V6, VIN W, USA *
Fuel Pump
- found insufficient fuel pressure and pressure was also bleeding off with key off. Replaced fuel pump.

Fuel Pump



Bobby Weige
June 28, 2011



1993 Chevrolet S10 Blazer, Tahoe LT 4.3L, V6, VIN W, USA *
Fuel Pump
- fuel preasuer 55 psi at cranking replace pump now preasure at 65 all is good now car fixed

Fuel Pump



Allen Price
September 22, 2010



1993 Chevrolet S10 Blazer, Tahoe 4.3L, V6, VIN W, USA *
Fuel Pump
284,009 miles

Fuel Pump



Al Sten
April 21, 2010



1997 Chevrolet S10, LS 4.3L, V6, Gas, Asp N, VIN X, 12V, OHV, FI, USA *
Fuel Pump
173,000 miles

Fuel Pump



Danny Cianciulli
January 22, 2008



1998 GMC Jimmy, SLS 4.3L, V6, VIN W, USA *
Fuel Pump
121,000 miles

Fuel Pump



Paul Palacio
October 31, 2006



1993 Chevrolet S10 Blazer, Tahoe 4.3L, V6, VIN W, Canada *
Fuel Pump
- replaced spider.fuel filter and fuel pump.fuel pump was the fix

Fuel Pump



North Lake Automotive
May 19, 2011



1997 GMC K1500, Sierra Special 5.7L, V8, Gas, Asp N, VIN R, 16V, USA *
Fuel Filter
Fuel Pump
- FUEL PUMP DRAINING BACK. REPLACED FUEL PUMP AND FILTER.

Fuel Filter, Fuel Pump



Leisure2
October 07, 2010



1997 Chevrolet S10, ZR2 4.3L, V6, Gas, Asp N, VIN X, 12V, OHV, FI, USA *
Fuel Filter
Fuel Pump
- TESTED FUEL PRESURE ONLY HAD 45 PSI NEEDS TO BE OVER 60 REPLACED PUMP AND FILTER NOW FUEL PRESURE IS OVER 60 PSI

Fuel Filter, Fuel Pump



CITYALIGNMENT1
August 06, 2007



1993 Chevrolet S10 Blazer, Tahoe 4.3L, V6, VIN W, Canada *
Fuel Filter
Fuel Pump
- fuel pump and filter fixed it.

Fuel Filter, Fuel Pump



Keith Gierisch
November 01, 2010



1993 Chevrolet S10 Blazer, Tahoe LT 4.3L, V6, VIN W, USA *
Battery Cable Terminal(s)
Battery Terminal Bolt
- fuel pressure was low while cranking due to low available voltage due to bad battery cable connection. replaced battery bolt, cleaned cable end, charged battery to 12.8v

[Vettezuki]

Thanks Paul for all your help. Sounds like it's just the pump. The filter is relatively new and all was working fine.

[enkeivette]

Prime it twice with the key before you start it. When you turn the key to the run position it turns the fuel pump on for 2 seconds, you can hear it whining. With the key turn it on, off, on, off, then crank.