Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
OCTOBER 2022
Vehicle was running very poorly engine light was on. Scanned and had a P0171 code
Vehicles fuel trims were high idle (+20-30 STFT/LTFT (46.9%) under load
vehicles fuel pressure was reading 26psi below factory specifications.
Replaced Fuel pump and vehicle was running fine, fuel trims returned to normal.
All is well...
December 2022
Vehicle bogs down and dies on the way home from work
Starts back up then dies almost immediately no CEL present
Vehicle was towed home
Fuel pressure gauge shows 20psi less than factory...
Upon removing petrol cap the Fuel pressure returns to a normal 40psi but STFT is still +30%
Things I have done
Confirmed no blockage from pump to rail
Replaced petrol cap
checked return line
