Help! Updating fuel system to delete in rail high pressure and reservoir on my 87 ranger.

[eezynee]

I have an 87 ranger with the 2.9 and the two fuel pump + reservoir system, I decided to replace the in tank sending unit with a newer pump (from the 90's ranger) to get rid of the inline pump and reservoir. Now that I've done this, what do I do with the electrical components of the old inline fuel pump? Since they aren't connected to anything it causes an error code for fuel pump circuit failure, does this matter at all? I haven't put the bed back on and driven it yet. Should I just stick a wire in each end of the connectors to complete the circuit? Thanks in advance!

 

[Shran]

Just ignore the fault code.

Definitely do not connect the wires together. I just left them unplugged on mine.

 

[RonD]

Shouldn't get an error code??

Gas gauge won't work, but no error code, lol

There are only 2 "fuel" electrical error codes:
87 (O) Fuel pump circuit fault
96 (O) Fuel pump monitor circuit shows no power

The Computer operates the Fuel Pump(FP) relay(green base relay in engine bay)
When you turn on the key the EEC relay sends 12v to the FP Relays coil, it goes thru the coil and to Computer's pin 22, computer grounds pin 22 to activate FP......AFTER "seeing" the 12volts first

If it doesn't see the 12v then code 87 is set

When computer closes FP Relay 12volts is sent to Inertia switch in the cab, then the 12v is sent OUT to fuel pump(s)
This 12v also goes to pin 8 on the computer, so it "knows" the FP Relay closed and 12volts was sent to fuel pump(s)
If computer doesn't see 12v on pin 8 then code 96

So unless you by-passed the whole circuit, not a good idea, there should be no codes just because you disconnected one of the pumps, or disconnected both pumps, computer just wants to see the 12volts on pin 8 when FP relay is closed

The 12volt wire from inertia switch is shared by BOTH pumps, so computer doesn't know how many pumps there are, it only knows if FP Relay is sending 12volt

95 (O) Fuel pump: open, bad ground or always on
You would get this code if pin 8 showed 12v all the time


Sender on a 1990 fuel pump assembly uses different OHMs than 1987 Gauge needs, opposite in fact, empty is full and full is empty

 

[Paulos]

I'm not sure why you would be getting the code (95 or 96 most likely), unless you upgraded to an '88 or later ECM. The inline pump circuit branches off to the in-tank pump (it's the same circuit).
When I installed an '89 ECM to delete the EGR and knock sensor I started getting a code 95. I connected pin #8 of the ECM to the line side (orange/light blue) of the inertia switch, and that solved the code 95 issue. Otherwise, like @Shran said, you can just ignor it.