Do you speak flow diagram?

[silver912e]

Greetings,

I'm not getting power to my fuel pump. I've verified that there is power to the relay. but no power comes out. I'm trying to understand what event causes the power to flow. I've attached a flow diagram of the relay. I've marked the fuel pump power.

Is this diagram telling me that when power is applied to the yellow (the line maked with the "??"), then the fuel line will have power?


Thanks.

[silver912e]

Here's the labeled pic

[Jim Sims]

year and model?

[Jeff]

From the diagram, It looks like the red wire to the left of the yellow wire powers the fuel pump. Try using a known good relay from something else to help diagnos. Your relay may not be working.

[marcesq]

Looks like a DME relay for a Carrera . . . . but I'm guessing based on the green/red power lead to the pump.

If this is a Carrera pump doesn't get power until engine is cranked as opposed to a pre '84 911 that gets power when the key is in the on position.

Did you try your spare DME relay . . . . . you do have a spare don't you

[FranksPlace2]

I believe those little numbers correspond to the numbers on the bottom of the relay.
See if you have voltage on the red (88y) and yellow (86a).

A jumper wire from red to red/green should make the pump run.

Frank