How to repair the fuel pump relay in a 1983 280 SL?

How to repair the fuel pump relay in a 1983 280 SL?

This video shows how to locate and repair the fuel pump relay in a 1983 280 SL. The video also touches on the fuel pump relays and fuses in earlier SL’s incl… This video shows how to locate and repair the fuel pump relay in a 1983 280 SL. The video also touches on the fuel pump relays and fuses in earlier SL’s incl…

How to change fuel pump Realy and OVP relay?

Tutorial on how to change a Fuel Pump Realy and an OVP relay. Symptoms of bad either are hard to start, low RPMs (300-600), seemingly weak response, won’t start at all, fuel pump not whirring when key is on ‘3’ position, and problems with uneven throttle.

What are the symptoms of bad fuel pump?

Symptoms of bad either are hard to start, low RPMs (300-600), seemingly weak response, won’t start at all, fuel pump not whirring when key is on ‘3’ position, and problems with uneven throttle. It is advised to rip these parts from a junkyard initially, as these may run you anywhere from $60.00 – $500.00+ at a shop or dealer.

Where does the current from the fuel pump relay come from?

This voltage comes from the ignition switch. The fuel injection computer then grounds circuit 1. This activates the fuel pump relay to pass current from circuit 4 to circuit 3. Circuit 3 is the one that runs to the fuel pump (via the Inertia Switch) and delivers the voltage/current it needs to activate.

Why does my Ford pickup have a green relay?

You’ll be able to find out if the fuel pump relay, or the fuel pump Inertia Switch, or the fuel pump is the cause of the No Start Condition on your Ford car or pickup. If your fuel injected Ford pickup, van, or car still has the Ford relay, this bad boy will be a green color (like the one in the image viewer).

What is the high current circuit on a fuel pump?

The high current circuit is the one that delivers the voltage (and thus current) to the fuel pump in the gas tank (or on the frame rail). When the fuel pump relay is off (not activating the fuel pump), the high current circuit is ‘open’.

How is circuit 3 connected to the fuel pump?

Circuit 3 is the one that runs to the fuel pump (via the Inertia Switch) and delivers the voltage/current it needs to activate. Before this voltage reaches the fuel pump, it has to go through the fuel pump Inertia Switch first. If the Inertia Switch has been tripped, it will ‘open’ the circuit and the voltage will not reach the fuel pump.