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Which one is the fuel pump relay. I am not getting any power to the rail fuel pump. is there anyway to tell the difference between the fuel pump relay and ecc relay?
Re: Which one is the fuel pump relay. I am not getting...
Swap them out they are the same one, they are the exact same relay so switching them wont hurt anything, that's the best way to see what the problem is
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No ,there isn't a fuel cut off switch on your vehicle . Ford vehicles have that ,not GM . Do you own a voltmeter ? Test the electrical circuit's before replacing parts . GM Fuel Pump Relay Testing
I can tell you several things and will add a few things because I do not know why you want to drain the tank. A Part called an Inertia switch will interrupt the power to the fuel pump if it is tripped. It has a Reset button and depending on your Year Grand Marquis, the part is in the trunk next to the Air suspension. Your pump may be good. Clogged fuel pump. There is a plastic screen which is on the fuel pump pick-up. It can disintegrate and clog the pump. Blow air into the fuel rail test port to shed the screen fragments back into the tank. Then try the next paragraph. Working pump with Low pressure. You can remove 2 things to pump out the gas.through the fuel rail. The test port on the fuel rail has a valve similar to an air valve stem. Removal of the valve seat from the test port allows you an open line to drain the tank. Go on the internet and find the procedures for jumping the fuel pump relay switch. The relay is in a black box which is piggy-backed on a Powerbox on the Drivers side of the engine compartment. The top of the piggy-back has 3 relays and a diode labeled and the trio slide out of the compartment by releasing some retaining snaps protruding out of the case. If you look under the relay there will be numbers by the contacts. I want to say that #27 and #34 are the two to be jumped. I may have the wrong numbers or your Year car may be different. One pin is a power source-the other goes directly to the fuel pump. With the ignition ON, placing a wire between these two contact holes will power your fuel pump. Have a hose clamped on the fuel rail test port which you removed the needle seat from and put the hose end into a gas can. I pumped close to 17 gallons of fuel from my 2002 Grand Marquis in a short time. The gas tanks have baffles. I tried 3 different hose sizes and could not get one to pass the baffles. The fuel filter disconnect can be a problem, especially with fuel pressure. So the easiest way to drain the fuel is through the test port. You can also siphon through the port with a hand drawn pump. Please rate my info.
Well you use a fuel pressure gauge to check pressure at the injector rail, and you can check for power and ground at the gas tank to make sure the pump is running.
That may be two different problems. Or not. You may have a relay problem that feeds power to the pump and the injectors but I doubt it. Usually the injectors get power from a relay or other source, and the computer provides ground to open them. You'll probably need to get a wiring diagram from the library or buy a shop manual to check the circuits.
Pull the relay and make sure you have 12 volts there. Pin # 30 is the power to the pump. this will tell you which way you have to go to find a short or corrosion in the wires. let me know
Randy
You can tell how to put a jumper across the relay primary by looking at the diagram on the side of the relay. But your problem is probably the fuel pump safety cut off. It is different on different cars, and I don't know where it is on a Saab. But I can tell you some cars use an oil pressure switch for this, and you can tell because it will have more than 1 wire then. Some cars like VW use the alternator, and a bad alternator will do it. Others, like Jaguar, use an inertial switch. It can be behind a kick panel, in the engine compartment, or even in the trunk on Ford.
The idea is you want the fuel pump to cut off in an accident.
fuse in the fuse box. also the power to prime the pump starts at the oil pressure switch. check that out too. then the relay for the pump in that order
Is the fuel pump actually coming on??? If it isn't, I would start by checking for a fuel pump relay. This is usually located up in the engine compartment in a black box on the drivers side. Relays are small black boxes approx 1"x1". These have a tendency to go out just like fuses. Also double check your fuses. If you suspect a that a relay is bad, you can interchange them with other relays that look the exact same to see if they really are the problems. These relays are very quick and easy to change and are very cheap. They usually run no more than $10-15.
Any further questions, feel free to ask.
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