Fuel pump relay?

Hi,

I am not sure I understand what you mean by holding down the wiper arm. Do you mean that when you turn the wipers on and you hold the arm so it doesn't move it does this?

Maybe get a video of what you are doing so we can get a better idea.

Also, I would suggest two things. It sounds like the fuel pressure is the issue. However, depending on what is happening with the wiper arm this may not be an abnormal issue. If you are holding the arm down then I am sure the wiper motor is straining to move and this may be pulling more voltage and this causes the fuel pump to run slower due to lower voltage. If this is the case, I would monitor both the fuel pressure at the rail and then the voltage at the fuel pump while this is happening just to see what is happening.

Just let me know if I am not understanding and we can go from there. Thanks

Okay. That clears it up. I would still suggest putting a volt meter on the pump to see what the voltage is doing when you are doing this. It could be a relay but we need to see that by holding the wiper on that the fuel pump is not getting 12 volts. I suspect this is what you will find but without this confirmation we are just going off an assumption and that could cause this to be very costly by going down the wrong path.

If you want to replace the relays first then that would be understandable if it is something easy but if not then we are going to need some evidence as to what is going on.

You can do this by just back probing from the under-hood fuse block on the gray wire. You don't need to go all the way back to the pump but you can if you want to.