Fuel Pump Whines

[v8fc3s]

So, recently I went on a nice long drive and when I got to my destination I noticed that my fuel pump was whining extremely loud. It isnt heard from in the cabin though, only when I poke my head out or drove next to something where it would echo back towards me. My question is, as far as I know, the car has two fuel pumps: the in tank transfer pump; and the exterior high pressure pump. Being that I hear the pump only from the outside I would assume that it is the exterior pump? Anyone have any input on this? I have done some research and havent been able to find anything to help answer my question. Obviously replacing both pumps would be the best thing to do but spending $250 just cause isnt for me.

Any input is appreciated. Thanks :mrgreen:

[jlevie]

A noise that you hear outside of the car near the left rear wheel will be from the high pressure. It can make noise because it is working too hard or just from wear. A clogged filter, obstructed fuel line, bad FPR, or bad in-tank transfer pump are all possible causes of extra strain on the pump.

A rusty tank is quite common on a car of this age. Rust in the tank will clog the filter and cause accelerated wear of the high pressure pump (rust is very abrasive).

[v8fc3s]

So the fact that the HP pump is making the noise is a possibility that it is working harder due to the transfer pump having failed first? I would imagine that be detaching the hose and running it to a bucket of some sort I can see if the transfer pump is working right? Or is there any method commonly used to troubleshoot or source which pump should be replaced?

[jlevie]

That is the obvious test for a failed transfer pump. Disconnect the high pressure pump so it won't run dry, then jumper the fuel pump relay to power up the transfer pump.

[v8fc3s]

I will get on it. Thanks for your help guys :)