[Missy]

Have a '97 Monte that will crank but not start, if it does manage to start, it will die in a couple of seconds. I have voltage at the relay, I have 5 volts at the fuel pump connector. Any ideas?

[Dave96Z34]

Bad ground corrosion on the connectors or wires.

[nitehawkjcb]

Did you check the fuel pressure? Unplug the MAF and try to start it too.

[me6894]

nitehawkjcb, on 16 October 2010 - 11:10 PM, said:

Did you check the fuel pressure? Unplug the MAF and try to start it too.

x2

[Missy]

nitehawkjcb, on 16 October 2010 - 11:10 PM, said:

Did you check the fuel pressure? Unplug the MAF and try to start it too.

I have 0 fuel pressure... Monte won't start...have spark, have voltage at contact (good contact) Have low voltage at fuel pump at key on, engine off (not that it would come on anyway) Haven't checked voltage at key on engine on

[me6894]

Actually, the fuel pump is commanded on for a few seconds with the key on engine off. What voltage is it reading?

[Missy]

Have about 6 v at pump with key on engine off

[Missy]

...the 6v is constant does not drop off after a few seconds like the voltage at relay. Just trying to confirm that the pump is dead or find out if it's a wiring problem

[ComradeRedXv2]

ar you turning the car to on and having a buddy read it? or walking back to it? if youre taking too long to get back to it, then youre probably not getting there in the time it takes the pump to prime

[me6894]

Pretty sure the pump has a 5v reference which is probably what you are seeing which isn't the power wire. What's your schematic say?

[Missy]

me6894, on 18 October 2010 - 10:43 PM, said:

Pretty sure the pump has a 5v reference which is probably what you are seeing which isn't the power wire. What's your schematic say?

Schematic shows a gray wire and a black wire... I have about 4 wires (purple, gray, black, and black w/ white stripe)

[me6894]

Missy, on 19 October 2010 - 11:57 AM, said:

me6894, on 18 October 2010 - 10:43 PM, said:

Pretty sure the pump has a 5v reference which is probably what you are seeing which isn't the power wire. What's your schematic say?

Schematic shows a gray wire and a black wire... I have about 4 wires (purple, gray, black, and black w/ white stripe)

Sounds to me like you have the wrong schematic.

[Missy]

me6894, on 19 October 2010 - 03:51 PM, said:

Missy, on 19 October 2010 - 11:57 AM, said:

me6894, on 18 October 2010 - 10:43 PM, said:

Pretty sure the pump has a 5v reference which is probably what you are seeing which isn't the power wire. What's your schematic say?

Schematic shows a gray wire and a black wire... I have about 4 wires (purple, gray, black, and black w/ white stripe)

Sounds to me like you have the wrong schematic.

Haynes book 90% right usually....

[me6894]

Something is obviously not right if the schematic only has two wires when there are 4 at the sender.

[Missy]

me6894, on 19 October 2010 - 09:51 PM, said:

Something is obviously not right if the schematic only has two wires when there are 4 at the sender.

Know of any sites I can maybe find the correct one? I need to get this thing running

[me6894]

If you don't have a full 12 volts at the gray wire at the pump module I would start by pulling the fuel pump relay and checking for corrosion at the contacts. If all is good there start either ohming out from connector to connector or do voltage drop tests.

This post has been edited by me6894: 20 October 2010 - 06:45 PM

[Dave96Z34]

Missy, on 19 October 2010 - 06:52 PM, said:

me6894, on 19 October 2010 - 03:51 PM, said:

Missy, on 19 October 2010 - 11:57 AM, said:

me6894, on 18 October 2010 - 10:43 PM, said:

Pretty sure the pump has a 5v reference which is probably what you are seeing which isn't the power wire. What's your schematic say?

Schematic shows a gray wire and a black wire... I have about 4 wires (purple, gray, black, and black w/ white stripe)

Sounds to me like you have the wrong schematic.

Haynes book 90% right usually....

Thats a joke you dont want to know how off it is on the lq1.

This post has been edited by Dave96Z34: 20 October 2010 - 09:57 PM

[Missy]

me6894, on 20 October 2010 - 07:37 PM, said:

If you don't have a full 12 volts at the gray wire at the pump module I would start by pulling the fuel pump relay and checking for corrosion at the contacts. If all is good there start either ohming out from connector to connector or do voltage drop tests.

Good to go! thanks...fuel pump crapped the bed.