Hello Everyone,

I am need of some experienced advice regarding my fuel issues. The vehicle started and ran after replacing a number of parts, but after being turned off, I have no fuel pump noise and the truck will not start. I have had this issue for a couple of weeks and due to the age of the vehicle I have replaced a number of parts as follow:

New in tank fuel pump and filter.
New inline canister filter.
New high pressure pump on rail.
New fuel filter between pressure pump and fuel rail.
New fuel relay.

I have also checked the fuse box, no evidence of corrosion and the fuse is fine as well. I went ahead and cleaned the fuse box with electrical cleaner, just to be safe.

If I try to turn the ignition on multiple times, or wait a while, it will start and run perfectly. Hence the replacement of the starter switch in the column as well as the ignition that was pretty loose.

I have checked the inertia cutoff switch and it is in order.

PLEASE help. I cannot afford to take into a technician.

Thanks in advance for any and all advice.

RJ

 

You need to find out if your loosing power to the fuel pumps.

some vehicles have a oil pressure switch that will shut off the fuel pump circuit if it senses low oil pressure. I am not sure if your Ranger has this protection built in or not.

Either way keep the problem simple for now and check the basics, check the oil level and coolant level.

When the engine is not running have an assistant help you crank the engine over and check for spark and injector reference pulse using a noid light.

You may have other contributing factors causing your truck not to start, it is best to know that your problem in only related to the fuel pump circuit.

If other circuits are effected this would change your starting point for diagnostics.

When you checked the fuses, did you use a test light to confirm battery voltage is going in and out of each fuse?

 

In the engine bay you will have the Computers OBD1 connector, it is loose but on the main wiring harness usually near firewall but have seen them under battery box.
They are used to read codes and check computer so not hidden but they moved them around in the engine bay.

Look here for drawing of the Connector: Ford Ranger - Testing EEC-IV Equipped Engines

On that drawing you will see a slot on the connector labelled Fuel Pump

The wire in that slot is spliced to the Computer's Control wire for the fuel pump relay.


When you turn the key on the EEC relay closes, it sends power(12v) to the EEC(computer), spark, fuel injectors and fuel pump relay.

Fuel pump relay is not grounded so even though it gets 12v if doesn't close to send power to fuel pump.
The computer Grounds the fuel pump relay to turn on fuel pump.
Same as it does for fuel injectors, just FYI.

So back to that slot on the OBD1 connector, FUEL PUMP
It is spliced to the wire the Computer Grounds to start fuel pump.
If the key is on and you GROUND that slot, fuel pump relay should "click" closed and fuel pumps should come on.

If relay doesn't "click" closed then it doesn't have power, check EEC relay is 'clicking" with key on, and check EEC fuse thats the power for fuel pump relay