Hi,

My turbo 740 fuel pump relay has been bypassed by an auto electrician so that the fuel pump is always powered with the key in the ignition position. I know that the fuel pump relay is normally controlled by the ECU so that the pump is powered whilst the engine is running/starting. Apart from safety (ie. if the car is in an accident and fuel is pumped everywhere etc. etc.), is there any problem with the fuel pump being permanently powered? Could someone direct me to, post, or send me information on the pinout for the relay?

Also, the fuel gauge drops to empty intermittently. Has anyone else had this problem and is it easy to solve (I presume by pulling out the fuel pre-pump assembly out of the top of the fuel tank and spraying the rheostat attached to the float with a cleaning agent). Apart from the safety warnings well documented in the FAQs, are there any other tips anyone would like to give me like perhaps, the voltages I should be seing at the connections at the two wires at the top of the assembly???

Thanks,

Ben

I would question why the mechanic would do this. If the relay is bad replace or repair by resoldering. If fuel and temp guage fail together problem is not in the sender but at the instrument cluster voltage stabilizer or a bad connection. Check sender unit resistance at access hatch in trunk, empty 300 ohms going down to 36 ohms when full.

Ben, Take out the relay and give it the “Don Foster treatment”. Re-solder all the joints. The relays are behind the ashtray in the front. Good luck.

I need some help: How much tension should one apply to remove a relay? I have tried tugging pretty hard at my fuel pump relay to remove it but it doesn't budge. Don't wanna break it. Is there trick to remove it? I've looked in archives and FAQ but no luck.

-HB

Have you removed the box below the radio? With the box removed you will have room to remove the relay, it should be tight but still easy to remove, try pushing the top back and forth then pull it up and out. It’s the white relay on the middle row left side.Good luck.