no fuel pressure

[87 tpi]

checked fuses no power to fuel pump fuse no power to ecm fuse, have power at fuel pump relay

[toobroketoretire]

checked fuses no power to fuel pump fuse no power to ecm fuse, have power at fuel pump relay

You may have a gummed up ignition switch. After a long time, the grease inside of them hardens so stinking hard, the contacts don't make contact anymore. Try taking your ignition switch off and fill it full of WD-40 and work it back and forth a thousand times. Or just replace it with a new one. After all, your switch is now 20 years old.

[vetteoz]

checked fuses no power to fuel pump fuse no power to ecm fuse, have power at fuel pump relay
Relay feed is direct of battery
There is fusible link on the feed that supplies the ECM and other circuits

[CFI-EFI]

new pump new relay no pressure help
Why so many parts at once? Did they both test bad?


checked fuses no power to fuel pump fuse no power to ecm fuse, have power at fuel pump relay
Are you checking for power to the pump fuse at a time when there is supposed to be power there? The fuel pump fuse only receives power when the fuel pump is energized. With the engine not running, that only happens for the first 2 seconds after the ignition is turned on, or while the engine is cranking.

If anything else works with the ignition switch "On", don't replace the ignition switch until you have specifically checked that circuit.

What lead up to this fuel pump/fuel pressure failure? Have you just completed any other repairs?

RACE ON!!!

[CFI-EFI]

Relay feed is direct of battery
There is fusible link on the feed that supplies the ECM and other circuits
The fuel pump relay "direct feed" is also through a fusible link.

RACE ON!!!

[toobroketoretire]

If I'm not mistaken, turning on your ignition switch also energizes your fuel pump fuse. I suggest you change your fuel pump based on years of usage alone. If it isn't the problem now, it will be shortly. Because the ignition switch is one of the most used electrical devices.

[vetteoz]

If I'm not mistaken, turning on your ignition switch also energizes your fuel pump fuse.

As CFI-EFI states above , turning the key on puts power to the ECM which runs the pump relay for 2 seconds only.The pump fuse is on the line to the pump after the relay so only hot after the relay is operational.

I suggest you change your fuel pump based on years of usage alone.

He hasn't determined if he has power going to the pump yet.
Assuming the pump fuse is good ;
Run 12V to terminal G on the ALDL and see if pump runs.This test wiring to pump and pump itself.Or jumper the red and orange wires at relay to see if pump runs.

[CFI-EFI]

If I'm not mistaken, turning on your ignition switch also energizes your fuel pump fuse.
Yes. I think I said that. But it only energizes the fuel pump and fuse for the first 2 seconds after the ignition is switched to "On". I think I said that, too. And it was echoed and confirmed by vetteoz. If he is checking for power at the fuel pump fuse with the ignition switch "Off" or after the 2 seconds elapse, there should be no power at the fuse.


I suggest you change your fuel pump based on years of usage alone. If it isn't the problem now, it will be shortly.Do you mean days of usage? As I quoted in my first post, he said both the fuel pump and the fuel pump relay were new.


Because the ignition switch is one of the most used electrical devices.Because an ignition switch is a highly used item, you recommend replacing a new fuel pump? Can you explain your reasoning? I don't get the theory of blindly throwing money, in the form of replacing untested, possibly good (in this case, already replaced, new) parts at a problem.

RACE ON!!!