Question about 1996 Chevrolet Blazer

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Engine wont crank without prime has good fuel pressure and a new injector spider

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This vehicle needs 65 to 70 psi fuel pressure.to start cold, it will run with 55 after priming

Posted on Oct 15, 2010

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Posted on Jan 02, 2017

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How to prime the injectors and fuel rail after replacing the injectors?


Electromagnetic or electronic fuel injectors are self-priming and all that is needed is to crank the engine, though I believe on later systems the injectors are coded and will not work unless the ECU has been informed the codes have changed. I think this applies more to diesels than petrol engines but on such matters I am not expert...

Staying with diesels for a moment - new injectors on either engine would usually mean fitting a new fuel filter. Sometimes this would require the primary diesel circuit to be bled in order for the high pressure pump to work.
The amount of starter cranking required can be cut by leaving each injector pipe loose in turn until diesel is dribbling from it.

Feb 20, 2016 | Cars & Trucks

2 Answers

Have a chev blazer 4.3 THROTTLE BODY V6 ,HAVE 2 SPRAY STARTING FLUID IN BREATHER & starts & runs all day,no problems . Shut off & in 5 min wont start again, unless u spray it 4 2 seconds again? Whats...


Maybe a problem in the fuel pump circuit. Check fuel pressure with engine off, and key turned to on, not start. If no pressure, diagnose the pump circuit at the fuel pump relay. One terminal for the relay would be the power feed for the pump. The engine computer signals the relay on for 2 seconds with key on to prime the system, also signals during engine cranking.

Feb 23, 2015 | Cars & Trucks

2 Answers

Truck wont start but spray a little ether in it and it will run until the ether is gone. I unhooked the fuel line on the fire wall and it only had gas come out of it when I cranked the motor over. I think...


When the key is first turned before cranking, the fuel pump comes on for a few seconds to prime the fuel system and bring it up to pressure and then shuts off. When you crank the engine, the fuel injectors start to function causing the fuel pressure to drop. So that's why the fuel pump kicks on while the engine is cranking and it will remain on until the ECM sees that everything is in working order and then commands the fuel pump to remain on until the ignition is turned off. Is this a 4.3L Vortec Engine? If so, the (CRAB) injection assembly under the intake is faulty. It looks more like a spider than anything else. Be sure that you have adequate amount of fuel pressure because the (Crab Injection System) won't work at all. If it's an eight cylinder, may need to use a injector noid light. It's a special design light that plugs into the injector harness connector and lights up in pulses when engine is cranked. If there is no light, trace and check all wires leading from injector harness to ECU. Hope This Helps.

Oct 02, 2013 | 1992 Mitsubishi Mighty Max

1 Answer

12ht wont prime


filling the filters before installing will make priming go more quickly.
once the pump is primed crack open the fuse line at the injector while cranking until you have fuel pulsing out, close it then move on to the next injector.
keep doing this until the engine runs smoothly.
it may start running before all the injectors have been purged so keep clear of all moving parts and a fire extinguisher handy would be a good idea.

Apr 14, 2013 | 1989 Toyota Land Cruiser

1 Answer

Im stummped my 1996 chevy s10 ran just fine one day it stalled on the highway its got fuel spark and good commpresion what sencor could be keeping it from starting


First, charge your battery all the way, Is your check engine light on? How did you determine you have spark and fuel? Did you try starting fluid?

Apr 23, 2012 | 2003 Chevrolet S-10

2 Answers

2000 S10 no start


I'd use a gage and check proper fuel pressure, key on engine off, 60--66 psi with spider fuel system.
Engine cranking did you visually check for spark at the spark plugs? Engine cranking is there a fuel injector pulse?https://s8.postimg.org/50arofh11/fuel_pump.jpg
Click on the link for fuel pump relay, you can check the fuse. At the fuel pump, gray wire is voltage, black is ground.

Apr 15, 2017 | 1997 Chevrolet S-10 Pickup

1 Answer

Silverado not starting unless prime


There is a check valve in the fuel pump that sounds like it may have gone bad. Check the fuel pressure at the shredder valve, there should be 60 to 65psi during the prime and will drop 5 psi when the engine is running. Once the fuel line is primed, check to see how fast you lose your prime. Since you replaced your injection system, we can eliminate the fuel pressure regulator leaking which was common on the injection system your truck run's on. If the fuel pressure drops fast then it's going to be a bad check valve at the fuel pump and it may be time to replace the fuel pump it self. Good luck and hope this helps. Note: do not try to start the engine with putting gas through the throttle body, it's been know for small fires to start and burn the spider injectors. 

Sep 04, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

96s10 starting problems replaced throdle position sensor,fuelpump relay,no start shot of starting fluid fires right up and runs


Check the fuel pressure at the shredder valve. You should have 60psi to 65psi with the fuel pump primed and engine not running. Once the engine has been started, there should be a 5psi drop. Make sure the fuel filter has been replaced and that the fuel pump is making at least 60psi. Anything less or more then 65psi will not activate the fuel injectors, the other thing to is that the spider injection system on the vortec are know to go bad and you may have to replace the system. Good luck and keep me posted, be glad to help you get your S-10 running 100% again. 

Aug 23, 2009 | Chevrolet S 10 Cars & Trucks

2 Answers

Good fuel pressure. engine turns will not start. runs if primed through trottle body.


Replace the fuel pressure regulator in the intake plenum. This is the No. 1 problem for hard starting with the 4.3 L engine. It leaks fuel and loses fuel pressure when sitting for a few hours. You can try to cycle starter for a split second without cranking wait 3 seconds the turn key OFF then repete 3 times then tryto start. This will build up lossed fuel pressure and verify leaky fuel pressure regulator. Joe ASE Master Tech

Feb 22, 2009 | 1999 Chevrolet S-10 Pickup

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