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Use compression barb fittings on the pressure side with fuel injection line NOT REGULAR FUEL HOSE THE REGULAR HOSE WONT HOLD UP TO THE PRESSURE. The return line can be regular fuel line because of the low pressure.
first locate approx area of leak, wet spot, smell. fuel lines run from top of tank in rear of vehicle to the front usually alomg the inside frame rail on drivers side and up into engine compartment (under the hood) to the back of the motor. it runs into fuel rail assy where the injectors are passing through a fuel regulator first. fuel line will have a valve similar to that on a bicycle or car tire and should have a tag on it, sometimes its on the fuel rail. trace the fuel line tu the fuel tank or from the tank to engine compartment while its running, in park with emergency/parking brake on to accurately locate leak but be careful for fuel that may be spraying. i recomend safety glasses and a flashlight. most common leaks are due to worn/bad seals in the "quick connect" connections or a crack it the line itself.
WHERE IS FUEL LEAKING OUT FRONT OR REAR OF VECHICLE DONT CRANK OR DRIVE VECHICLE UNTIL LEAK FIX.LEAK AT FRONT IS A FUEL LINE AT FUEL RAIL TO PRESSURE REGULATOR.OR LEAK AT THE REAR CAR COULD BE LEAKING FUEL LINE AT FUEL TANK OR HOLE IN THE FUEL TANK..
Ok sounds like a electrical problem being an 89 its fuel injected eather 5.0 or 5.8 each tank has its own fuel pump and sending unit a dashboard switch, relay, fuse and switching motor. check your fuel line from the front tank it could be clogged. check for 12v pwr. to the front pump the sending unit will require 4V but not much. as soon as the fuel rail pressureizes the ECM shuts the pump off using the relay. Usually the tank switch goes bad first.
Does you truck restart after dying and then run ok or does it stay dead until switching back to the rear tank?
It could be that the front tank has a leak in the suction line which will leak when not in use and **** air when you switch to it.
A suction air leak could be the reason for it dying when switching tanks
Your vehicle only has one set of connections to the heating system, and you disconnected them when you bypassed the heater core. There is not a seperate heater core for the rear heat, just ducts off of the front heat.
The leaking from one tank to another was covered by a recall from Ford. Not sure if they still foot the bill for installation of the required check valves. These are still available from the dealership. The rear one is the hardest to install. The check valve can be installed without pulling the rear tank. As for your front sender I would clean all of the connections to the sender and make sure it has a decent ground. If it still only reads at the 1/4 tank level you will have to replace the sender to rectify the problem.
I have to say i'm only guessing, but it sounds like the valve that switches the flow of gas from one tank to the other must be sticking part way open, or bypassing or something, and anything your engine doesn't require, is being returned to the front tank, instead of the rear.