My 2004 SR4 (which appears to be very similar mechanically to an early SR1) seems to be having issues getting enough fuel pressure.
From what I can tell, I only have an inline fuel pump, probably a Bosch style (larger yellow circle in first pic). Not sure if this was the factory setup or not, I wouldn't be surprised if this setup was done after leaving the factory but before I got it. Some pictures below.
Am I correct that this is the only fuel pump, i.e., there shouldn't be a pump in the tank?
I can't hear another fuel pump and I don't want to take off the skin if I can avoid it (rivets everywhere).
When I turn on the ignition/fuel pump, I hear the inline pump run for a bit and build pressure and then it stops. Is there a pressure sensor/switch built into the pump? I can't find a pressure sensor anywhere else.
I do have an in-line fuel filter (smaller yellow circle in first pic).
Planning to replace the inline pump but would like ideas on what type would be best.
Thanks all.
Do you have a fuel pressure gauge? If you do what does the pressure build to before it bleeds off? If it builds up to a solid working pressure it could be your fuel pressure regulator is faulty.
I bought a fuel pressure gauge set but none of the connectors fit the fuel rail AN fittings and I didn't get a chance to buy one.
But I disconnected the elbow at the end of the fuel rail and ran the pump and once turned on it burped out some fuel and then just a trickle, so I'm assuming that's a fair indicator that the inline pump is bad since this test is done before the regulator. Is my thinking sound?
I also wanted to make sure I don't also have an in-tank pump in this older car.
Well, the problem is fixed. Seems the previous owner or the shop he had working on the car had the fuel lines to/from the tank reversed. So the return was hooked up to the external inline pump and the supply was hooked up to the regulator. Figured it out when I disconnected the fuel pump and saw a dry line and then disconnected the regulator and had gas flowing out.
Reversed those two lines and she started right up.
I think in the past I must have had the tank almost full most of the time so that the return line was able to scavenge gas IDK but very weird.
Well then.... Easy fix lol
