Established in 1998, China Dianshen Electric Co., Ltd. is a professional fuel pump relay manufacturer and fuel pump relays design of electric and electronic products. Together with the European 'CE', 'CCC', GS/EMC/LICE/UL/CSA, and 'CB' (IEC) certification that we have received for various series. Currently, our custom fuel pump relay product series are being exported worldwide. Our pursuit of first-rate quality, competitive and cheap fuel pump relays prices and comprehensive after-sales services offers both potential and long-standing clients confidence in our company.

The fuel pump relay unit on 1978-on (or so) K-jetronic-equipped 240s is actually more than just a simple relay. It also contains a circuit that listens to the ignition system to determine whether the engine is running. When the unit detects an ignition signal, it switches the fuel pump on. When the ignition signal stops, it switches the pump off.
The fuel pump relay unit is located under the dashboard in the vicinity of the steering column. I have found them clipped to the crossmember where the steering column mounts; and I have also found them mounted higher up between the instrument cluster and the firewall. The unit is usually either black or mustard yellow and has a six-blade connector on one end.

The Calibra Fuel Pump Relay degrades over time, due largely to the frequency of use and inadequate spec of the OE part.
Symptoms of a degraded FPR are inability to restart the engine from warm/hot (no fuel supply to rail) but when engine cools starting is no longer a problem. As far as I know the FPR is common to all Calibras - same part no.
The relay is of the plug-in type and can be taken out easily, pop open the plastic casing by prying the case apart so that the end with the connector slides past the retaining wedges. This is a little bit difficult, but can be done without damaging the unit. In most cases the bad solder joints can simply be re-soldered. Even if you do decide to replace the relay it may pay to fix the old relay and keep it in the car as a spare, it could save you a lot of hassle.

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