Question about Ford Mustang

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I have a 1998 gt mustang i recently put a 255lph pump in alls been fine since, had a tun and all for all the mods. but the other day the car wouldnt start. primed the throttle body and was able to get to run that fueloff, but no fuel pressure would develop at the fuel pressure regulator? when key goes to on position i can hear fuel being pumped to the regulator. fuse looks good ,aparently it is because i can hear it priming in the on position, iis there a fuel pump relay that transfers power to the pump in the start position? My next step is to pull the fuel line off at the regulator and dropit it in a coffee can and go to both the on and start positions. I think on the start position there will be no pumping of fuel...... just because i hear the pump priming in the on position doesnt meen im getting pressure to the regulator right? It shows no pressur either way at the ful pump regulator! Anybody have any ideas?

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A couple of extra checks are turn the car over and try to start while some one squeezes the fuel return line,At the rail,with tool that doesnt damage fuel line.It eliminates fuel bypass through the fuel rail.No need to undo anything.Have someone confirm you have power while Cranking at the fuel pump end.It eliminates power supply issue.If these two test work out ok then the pump is looking very much like the culprit

Posted on Oct 18, 2008

  • tony yeatman
    tony yeatman Oct 18, 2008

    Im assuming youve replaced the fuel filter and made sure therse no blockages.



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