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90 240 no fuel in rail?

While driving down the road my 240 just quit. I pulled off the fuel line coming out of the fpr and no fuel in rail. I took the cover off of the fuel pump relay and jumped the second relay and the fuel pump started working. When I turn the ignition on the first set of contacts engage. If I hold the second set of contacts together the car will run. As soon as I let the contacts go the car stalls. What causes the second set of contacts to activate the fuel pumps? The blue/green wire has no voltage going to it when cranking the starter if that's any help. I read something that it might be the rpm sensor where ever that is. Any advice much appreciated? Thanks Larry

Reply to
lrego
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The second set of contacts are closed when the fuel computer gets a signal from the ignition computer that the engine is turning over. So if the ignition is not working, then the fuel pump relay will not engage. However, since your car will start if you manually engage the relay, then the problem most likely lies in the fuel computer. The failure of this circuit is quite common. You can bypass this internal circuit by using a fuel pump relay from one of the older K-Jetronic cars.

Reply to
Mike F

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