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1998 chevy blazer fuel pump is putting out 55 psi but no gas is getting to the cylinders

It is a 4.3 vortex with throttle body injection.........this car is a 4x4 s -10 blazer

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  • Cars & Trucks Master
  • 2,431 Answers

4.3 TBI (throttle body injector) You dont have a TBI you should be equipt with a CSFI people in the field call this the spider injector,they inject fuel into tubes for each cylinder , as for the fuel pressure it should be 54 psi to 60 psi,and this is for a 4.3, The CSFI system does plug up which causes rough idle due to the poppet valve or seat,to stick open or closed,Ive ran fuel injector cleaner that has been sucesfull maybe you can try that

Posted on Nov 09, 2012

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Posted on Jan 02, 2017

csmock132
  • 4669 Answers

SOURCE: 1990 chevy blazer 350 ci throttle body fuel

Sounds like you have an injector leaking. Have someone just cycle the key on and off to run the fuel pump but don't crank the engine. If you see fuel dripping from the injectors, unbolt the injector cover on the throttle body, remove the injectors and replace the orings around the injectors.

Posted on Jul 22, 2010

  • 507 Answers

SOURCE: 1998 chevy tahoe 4x4 wont

fuel pump or fuel pressure regulator. When you turn the key do you hear fuel pump run? If not odds are the pump is bad.

Posted on Aug 23, 2010

airjer995
  • 5332 Answers

SOURCE: 97 jimmy runs when you

If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

Posted on Oct 17, 2010

  • 140 Answers

SOURCE: got fuel got spark turns

fuel pressure regulator bad,full bypass when vacum applied.

Posted on Feb 19, 2011

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1 Answer

What should fuel pressure be to start blazer


Normal cranking pressure is 70psi. It won't start if pressure is below 60psi.
Engines with multi port injection runs on 35-40 psi. and engines with throttle body injection run on 25 psi.

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Hello: 1st, pumping the accelerator on a fuel injected GM car does NOT do any good. In fact if you put the accelerator to the floor you put the system in the lean mode ie, reduce fuel. You will need a fuel pressure gage and there should be a schrader valve on the fuel lines/fuel rail where you can connect the fuel pressure gage. The fuel pressure should be about 10 psi if you have throttle body injection. Is your car a 4 cylinder? If its a 4 cylinder you may not have a schrader valve to connect the pressure gage. You will need a high dollar kit to tap into the fuel line. Have someone attempt to start the car and you remove the air cleaner an see if the injector is spraying fuel.

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i'm pretty sure you have a Central Port Injection setup on this engine. Which means the injectors are inside of the upper plenum and cannot be seen. This type of fuel injection system uses a centrally located electric fuel injector(s) which feed fuel to a mechanical poppet style injector which is routed directly above the intake valves for each cylinder.

The poppet valves require a minimum of 56 psi of fuel pressure. If you have 55 psi it will not start. It needs the fuel pressure to overcome the mechanical resistance of the poppet injectors. Fuel pressure should at least be 60 psi. It is very important to check fuel pressure with an accurate gauge.

If fuel pressure is low it will not start no matter what you do and a new fuel pump will likley fix the problem. Get a good quality pump such as an a/c deco or Dephi. Other brands may be cheaper but they will not last.

If fuel pressure checks out good let me know and I'll give you some more info.

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Im sure if its fuel causing your misfire but here are the fuel pressure specs depending on which one pertains to yours if your has a TBI Throttle Body Injected the the fuel pressure should be approx.9 to 13 psi if you have Multiport Fuel Injected (MFI) then the pressure should be approx. 41 to 47 psi if its Central Multiport Fuel Injected (CMFI) then the pressure should be approx.58 to 64 if you have Central Sequential Electronic Fuel Injected (CSEFI) then the pressure should be approx. 55 to 61 all these pressures are key on engine off if you start the engine and take a reading then you will have a decrease in reading by about 3 to 10 psi.

May 04, 2011 | 1997 Chevrolet Blazer

1 Answer

Hello - have a 1998 chevy blazer with a p0301 code. Know that cylinder 1 is the problem. New plug on cyl 1, and know it's not the wire. Also put new cap and rotor on. Any suggestions on what to do next?


If your Blazer has a "VORTEX" engine, the the fuel injection system will cause this DTC. Under the intake plenum ( that big plastic cover) is a spider legs injection system. that is one main body and up to eight legs that simply clip into the heads. Over time, crud gets into the passage that the injector goes into and causes the tip(s) to get dirty and the only way to clean it is to remove the system and clean all the tips.

Mar 24, 2011 | 1998 Chevrolet Blazer

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leaky injector/s is flooding motor, mechanically clean or replace. And clean throttle body while you are at it with spray cleaner. Should be almost spotless where large throttle valve opens and closes.

Oct 21, 2010 | 1998 Chevrolet Blazer

1 Answer

97 jimmy runs when you pour gas into throttle body, fuel pumps is putting out 55 to 56 psi. but will not pickup the gas from the injectors, fuel manifold psi is 55 to 56psi. 1997 4.3 vortec engine


If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

Oct 17, 2010 | 1997 GMC Jimmy

1 Answer

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check to see if your getting a pulse on the injectors
if it has the spider injector with a fuel pressure gauge check pressure see if it drops or have 55 to 66 psi check to see if also check the eng 1 fuse cgeck ecm 1 15amp

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