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Bad fuelpump or a vacume leak at the pressure valve on the end of the injection rail or injectors leaking no gas smell around car is it hard to start cold or hot no check engine on
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It could be a leaking fuel injector or a bad fuel pressure regulator. Do this plug the fuel return line then turn the switch on then off, if the pressure holds replace the fuel pressure regulator. If the pressure bleeds down remove the fuel rail with the injectors still attached and see which ones leak. I hope this helps. Take care.
I'd use a fuel pressure gage and check correct fuel pressure. Once correct pressure builds up, see if pressure holds for a bit with everything off? If pressure drops like rock, you have a fuel pressure leak. Another thought would be evap leak?
How long since a tune-up? Any applicable trouble codes?
Use a fuel pressure gage, check for proper fuel pressure, key on engine off. Then with key off, see if pressure will hold for a bit? If the pressure drops like a rock, check for a fuel pressure leak, check for fuel injector leak and fuel pressure regulator leak. If fuel pressure regulator is connected to fuel rail and has a vacuum line, check to see if gas in the vacuum line, if so, pressure regulator is faulty.
Check for applicable trouble codes? How long since a tune-up?
Fuel from the pressure regulator can't enter the intake manifold with out passing through the injector first. That means that if you have a leak in the inlet manifold you have a leaking injector.
A fuel pressure regulator is no more than a controlled leak. You test pressure on the fuel rail, if you have pressure you have fuel to the injectors.
The regulator controls that pressure by controlling the return flow to the fuel tank. You are in trouble when a pressure regulator does not flow (leak) fuel from the pressure (fuel rail) and return ports.
To test weather a injector is leaking you remove it from the inlet manifold and pressurize the injector.
COULD BE FUEL PUMP.CHECK FUEL PRESSURE SHOULD BE 40 - 47 PSI. WITH NEW FUEL FILTER. IF FUEL PRESSURE OKAY.YOUR SPARK PLUGS COULD BE FOULING OUT BY LEAKING FUEL INJECTORS.CLEAN FUEL INJECTORS BY ADDING A CAN OF SEAFOAM TO 3/4 TO FULL TANK OF GAS.WHEN YOU HOOK UP FUEL PRESSURE TESTER WITH IGNITION SWITCH ON ENGINE OFF FUEL PRESSURE SHOULD READ 40 PSI. TURN OFF IGNITION SWITCH IF FUEL PRESSURE DROPS FAST YOUR FUEL PUMP CHECK VALVE BAD.IF FUEL PRESSURE DROPS SLOWLY IN TEN MINUTES TIME FUEL INJECTORS IS LEAKING A NEED CLEANING.INJECTORS SPRAYING TIP CLOGGED WITH CARBON BUILD UP CAUSING THEM TO LEAK DOWN WHEN ENGINE OFF.
A defective fuel pressure regulator (located on the fuel rail) may have blown the gasket on the fuel pump (located in the gas tank). Another thing to check - the car's computer may have posted an error code from the fuel tank pressure sensor.. I'm not sure, but if this sensor shows pressure building in the fuel tank, rather than let it explode its seals, the sensor may intentionally leak fuel in order to relieve the internal fuel pressure build-up inside the fuel tank.
On the fuel rail (supplies fuel to the fuel injectors on top of the engine), there will be a Schrader valve, which is your connection to connect your Fuel Pressure Gauge to your car's fuel rail. Give it a check, but put a shop rag around the connector as your screw it in - fuel (and fuel pressure) will leak as you install the fuel gauge.
You may get computer diagnostic codes P0158 or P0159 - see below for interpretation. Note that the PCM is the Powertrain Control Module, which is the car's computer. Also "TP sensor" is the throttle position sensor. --------------------------------------------------------------------------------------------------------------------------------------- Trouble Code: P0158
Meaning: HO2S-22 (Bank 2 Sensor 2) Circuit High Input
Possible Causes:
Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
HO2S element is silicon, water or fuel contaminated
HO2S signal circuit is shorted to system power (B+)
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
1994 Chevrolet S10 Blazer 4.3L, Vin W
Customer Concern:
DTC 45 The spark plugs are black on both banks. Right bank plugs are damp. Removed the tuning valve and looked inside the plenum. Can see a washed/clean area on the right side. Fuel pressure is good, it holds when the pump stops.
Tests/Procedures:
1. Remove the upper intake plenum cover and inspect for a fuel leak at the fuel pressure regulator.
2. Inspect the fuel pressure regulator and return lines and fittings at the left side of the plenum.
3 Replace the Central Multipoint Fuel Injection (CMFI) unit.
Potential Causes:
Leaking Fuel Line - One or more may have a problem. Leaking Fuel Pressure Regulator Tech Tips:
The fuel pressure regulator may only leak at a cold or hot engine, only with vacuum applied, or only without vacuum applied. The leaking at the fuel lines and fittings have as often been the result of repairs as the initial cause of the problem. Handle the lines and fittings carefully. The fuel pressure regulator is a integral part of the Central Multi-port Fuel Injection (CMFI) unit. Any failure requires entire unit replacement.
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have you run a fuel pressure leak down test? if not you need to do this test, borrow or buy a fuel pressure test gage, they are about $12 at Kragen, the fuel pressure test port is on the top of the engine in the fuel rail that goes over the injectors, looks like a tire valve, hook up the gage and verify you have no leaks, then start the engine and turn if off while watching the fuel pressure, the pressure should not bleed down by more than 5 pounds after engine stops running, if it quickly looses pressure u will need to replace the fuel pump, this is called a leak down test, fuel pressure leak down is the #1 cause of hard starting rough running cold, other things cause it as well like a loose timing belt and worn out plugs and dirty fuel injectors, and worn engine parts, but start with the leak down and then go from there.
Release fuel pressure by removing fuel pump relay and turning engine over to release pressure. Place a rag to catch any fuel under regulator Fuel pressure regulator has a locking clip pry clip off remove vacuum line pull regulator out with twisting motion,replace fuel pressure regulator install clip connect vacuum line install relay. Check for leaks,your done.
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