How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Tim Mohr Your Own Question
Tim Mohr
Category: Car
Satisfied Customers: 15714
Type Your Car Question Here...
Tim Mohr is online now
A new question is answered every 9 seconds

1996 cadillac deville: with a 4.6 liter northstar engine..fuel pump

This answer was rated:

I am working on a 1996 cadilac seville with a 4.6 liter northstar engine. the fuel pump was replaced in sept. for not starting. now when you are driving it it starts to get sluggish and will only go about 20mph. when it does this the fuel pressure drops almost to 0. could it be a defective fuel pump or possibly a bad regulator and is there a way to check for what is bad
Hi, my name is XXXXX XXXXX is most likely abad fuel pump, but you can check this easily, when the pressure drops, pinch off the return line to the tank, if the pressure comes up, then its a bad regulator, if it doesnt, then its a bad fuel pump, most common is the fuel pump, the regulator rarely fails on these,Tim
Customer: replied 6 years ago.
it only will do it while driving it down the road can the line be pinched off and take it for a drive without hurting anything
yes, but not for a long trip,Tim
Customer: replied 6 years ago.

it has 2 return lines at the regulator wich one do i pinch off one or both


the smaller one
Tim Mohr and 7 other Car Specialists are ready to help you
Customer: replied 6 years ago.
thanks for the help pressure still drops with line pinched must be the quality parts we get these days
Yes, we get alot of bad ones, we only use the delphi pumps from Napa anymore, the airtex pump fail frequently, and most parts houses sells the airtex, try and get a delphi if you can,Tim
Customer: replied 6 years ago.
it was a delphi from napa i guess you just cant always get a good one
that is true, especially these days, get it warrantiied by napa,Tim