Is there a way to test the fuel pump relay on the L-Jet cars?
OK, you lost me.
The tank is full - I didn't trust the gauge so I topped it off.How much fuel is in the tank?
If the in tank pump is bad the car will/should still run. The main pump doesn't pull well. It is designed to push. The in tank pump flows a steady stream of fuel past the main pump inlet. If the tank is full enough and hills, turns, spirited driving are avoided you may only notice some poor running, especially under the above circumstances.
If the stepped rubber hose is cracked or missing it will allow air into the system and the main pump will see no fuel
The CSI gets a steady 12v. It is either on or off. The main injectors get pulsed.