[markleeblue]

i have 1995 devile,base.
1,my engine runs rich:
black ring on spark plug

long fuel trim alway stay under 128,open loop stay from 80 to 110.after warming up stay from 107 to 120

short fuel trim stays 80 to 112 at open loop, it is normal at close loop, jumping around 128.

2,fuel actually used is 20 percent higher than the fuel gauge read reads

3, i can smell fresh gas when i open throtle valve(butterfly).

anyone can help?

 

[Ranger]

Have you checked the FPR? I would bet you'll find it is leaking.

 

[markleeblue]

thank you ,ranger .

i check fr but no leaks

 

[Ranger]

Did you try to add vacuum to it while it was under pressure?

 

[markleeblue]

no ,i didn't,

you mean i have to buy a vaccum gun?

 

[Ranger]

Nah, just put a vacuum hose on it and suck on the other end. If there is a leak, you'll see gas leak from the hose when you disconnect it.