My 1998 chevy tahoe with 5.7 Liter, 4X4 Automatic is hard to start when the motor is cold, runs good & starts ok when it is warmed up. Acts like it may be flooded. I've replaced the fuel pressure regulator & fuel filter. The fuel pump has been replaced about 16 months ago (twice). There isn't any fuel pressure in the lines after it sits for a short time, where is the fuel pressure draining to? Thought it might be the check vavle in the fuel pump, or the seals in the fuel injection module.
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Re: 1998 Chevy tahoe Hard to start when cold
Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.
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i would first try to replace the fuel filter.usually there filter accumalates debris in the gas tank especially if you you ru the tank close to empty.filter location needs to be traced from the tank toward the motor.you will see a cylinder inline with a strap.part usually runs around 20.00. also when you initally turn the key before start you will hear a hum for about 2 sec. this is the fuel pump pushing the fuel up to motor.so if you hear this pump is working.
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