Re: 1997 5.7 Gsi will not start
The 10 seconds of run time may indicate that the start-by-pass circuit is energizing the electric fuel pump during this "Start-By-Pass" mode only.
Originally Posted by pnkmcneil
The "Start-by-pass" mode is to operate the pump during cranking only, until oil pressure comes up.
In your system, there will be a N/O oil pressure switch that will operate the fuel pump once engine oil pressure is maintained.
(the function of the "start-by-pass" circuit is to operate the fuel pump in lieu of oil pressure)
Try doing some circuit testing to make sure that the N/O oil pressure switch is functioning properly.
Test the pump itself to see if works independantly of the By-Pass or oil pressure switch!
You may need to temporarily circumvent the N/O oil pressure switch.
Do NOT circumvent this long term..... it is against USCG regulations.
Low Oil Pressure MUST be able to shut the fuel supply off.
NOTE: since you changed the fuel filter cartridge (and if you did not pre-fill it), and if you DO have a pump energizing issue , the cartridge change may have exaggerated the problem.
Use a simple P of E.... (process of elimination), and one item at a time.
You'll find the problem if you do so.
Last edited by RicardoMarine; 09-08-2011 at 08:59 AM.
Rick ... aka Ricardo
28' SDN F/B w/ twin Volvo Penta 5.7L DP's