95 LT1 Fuel problem?
#1
95 LT1 Fuel problem?
Alright just bought the car a few weeks ago and replaced the coil, I'm, and starter. It seems like every time I get gas my car doesn't wanna start for awhile after. I can hear the fuel pump. But it just cranks and won't turn over. Gotta wait a few mins every time my car turns off.
#5
#7
Re: 95 LT1 Fuel problem?
If it starts quicker with the pedal on the floor, it may be indicating the engine is flooded.... example - leaking injectors. But the question remains why only on a new tank of gas? Do you tend to overfill the tank? That can cause problems with the carbon-filled fuel tank vapor collection system.
Checking the fuel pressure would be a good first step, as noted in an earlier post. Turn key to “run” (not “start”). Watch gauge to note peak fuel pressure when the pump stops priming (after about 2 seconds pump run time). Should be at least 40 PSI. Then watch to see how fast the pressure drops. Rapid pressure drop can cause extended cranking time.
Checking the fuel pressure would be a good first step, as noted in an earlier post. Turn key to “run” (not “start”). Watch gauge to note peak fuel pressure when the pump stops priming (after about 2 seconds pump run time). Should be at least 40 PSI. Then watch to see how fast the pressure drops. Rapid pressure drop can cause extended cranking time.
#9
Re: 95 LT1 Fuel problem?
The pressure should hold, or drop slowly. Causes of rapid pressure loss:
1 - leaking check valve in fuel pump
2 - leaking injectors
3 - leaking fuel pressure regulator diaphragm
4 - fuel pressure regulator not closing off fully, allowing pressure to bleed off into return line
5 - leaks in fuel supply line, including flex pipe in tank
To check #2, pull rails up with injectors intact. Key to “run” to pressure fuel system, look for drips.
To check #3, look for wet fuel in the vacuum compensation line to the fuel pressure regulator.
#1, #4, #5 harder to diagnose. But #2 and #3 could cause a flooded condition.
1 - leaking check valve in fuel pump
2 - leaking injectors
3 - leaking fuel pressure regulator diaphragm
4 - fuel pressure regulator not closing off fully, allowing pressure to bleed off into return line
5 - leaks in fuel supply line, including flex pipe in tank
To check #2, pull rails up with injectors intact. Key to “run” to pressure fuel system, look for drips.
To check #3, look for wet fuel in the vacuum compensation line to the fuel pressure regulator.
#1, #4, #5 harder to diagnose. But #2 and #3 could cause a flooded condition.
Thread
Thread Starter
Forum
Replies
Last Post
deftoned95Z28
LT1 Based Engine Tech
5
04-01-2005 09:07 PM