Question about 1998 Chevrolet Blazer

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4 3 vortec v6 fuel pressure problem

Replaced heads and now cant get it to start. No fuel pressure and recently replaced spider system. Turns over but wont start. HELP

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  • 45 Answers

If you have no fuel pressure, then that is definitely where your problem is. When you turn the ignition on, the fuel pump should run for about 1.8 seconds and build about 55-60 psi of fuel pressure. If you turn the key to the run position and don't hear the pump run, you need to trace back to why it is not coming on. Make sure there are no security issues present. Fuel pressure can be checked by installing a fuel pressure gauge to the schrader valve (it looks like a tire valve) which is located on the fuel supply line right where the fuel line connects to the spider system. Replacing the heads should not affect the starting of the vehicle in terms of before and after provided everything has been installed and hooked back up correctly. Make sure all connections are tight and pay close attention to the ground wires. There is an important ground that goes from the back of the left head to the firewall. If the battery went dead during the repair and a charger was connected with the ignition on, computer damage may have resulted. If you determine that fuel pump issues are present, make sure you examine all of the electrical aspects before replacing the pump. Even though fuel pump failures are common on these vehicles, they are expensive and often not the cause of a fuel supply problem.

Posted on Apr 23, 2014

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Posted on Jan 02, 2017

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SOURCE: wont start has fuel and has spark

RC ralston
Your problem is a leak in the cpi pletium most likely the pressure line has a leak
had same problem with mine $45.00 PRESSURE LINE KIT AND $15.00 GASKET FOR PLETIUM and 2 hours labor problem sovled.
You can remove vortec cover and remove air regulator to look inside pletium. I had gas vapor on driver side . that is where fuel lines are. fuel regulator is on passenger side. turn key on and look in hole and see where fuel is spraying. taking pletium off you can again turn key on and make sure where fuel is coming from.

Posted on Feb 06, 2009

  • 74 Answers

SOURCE: 1998 Chevy tahoe Hard to start when cold

replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump

Posted on Feb 17, 2009

  • 1 Answer

SOURCE: 97 z71 vortec 5.7 replaced fuel pump.getting fuel but won't start

The # 5 cylinder is miss firing. not getting fuel. Could the injector just be stopped or the crankshaft sensor in gone.

Posted on Jul 24, 2009

  • 1 Answer

SOURCE: 1997 astro 4.3 vortec v6 fuel pressure problem.

have you made shure there is fuel in the tank, they had alot of problems wth sending units on that year. if so chances are its the fuel pump. try banging on the bottom of the fuel tank while sombody tries to start the vehicle, if it starts replace fuel pump. faulty regulators will usually cause a very rich running condition.

Posted on Sep 02, 2009

  • 153 Answers

SOURCE: 1992 vortec v6 motor getting spark and strong fuel

the probem is probably in the injector assembly whichis under the intake plenum.after removing it you will se the plastic tubes and ijector popit valves unlike actual individual injectors.this whole contraption must be replaced as an assembly.you can get repair manuals from this site or go to you library.it may actually be flooding as these had problems with leaking fuel pressure regulators which i think are also only part of the whole assembly.

Posted on Feb 14, 2010

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Please rate the answer you received. This is how we know your answer helped. Should you need further help please just ask. Thank You for using Fix Ya. Roger

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