I am not getting a signal to my fuel pump, fuel pump relay nor the 10 amp fuel pump relay fuse. I have checked my wiring from the ECM to the FPR and it is good. Where does the power come from through the ECM to the Relay? Should the 10 amp fuse be hot in run? (the fuse is good) I also have no power at the 3amp fuse for dash light next to the 10 amp Fuel pump relay fuse? Is there a common I should be looking for? Thanks for your help. Tony

There are two voltage circuits at the relay, one is the ecm B fuse, did you check that ? There are two side of the relay, the load side, see the arm with arrowhead, when relay is energized, that arm moves to other terminal carries voltage to pump motor on gray wire.
The control side of relay is the coil looking sign in the diagram, gets voltage from pcm, the black wire is chassis ground. Just to add, I looked at 6 cylinder.

The ECM sends a GND signal to the Fuel Pump relay to switch it ON. When 'jumping' relays, there is a risk that you might feed +12V to Gnd switch line, in this case the ECM line. If left too long, this would blow the diodes in the ECM. Try using another ECM. Try following the ignition circuit from the ignition coil back to the ECM. One of the wires connected to coil should have +12v when IGN on. Sparking only happens when ECM sends GND pulses to the coil. If ECM is OK, check camshaft position sensor, which is also usually referred to by the ECM for ignition firing.

check for a problem fuel pressure regulator
most are wired to the ECM which is connected to the relay for the pump
it works like this
with low / no fuel pressure the regulator completes a circuit to the ECM
that signal is then sent to a relay to start the pump
when full pressure is reached , the regulator signals the ECM and the relay is turned off hence the pump is not continually running when pressure is not required

the oil pressure sensor has a 3rd wire which feeds to the fuel pump .. If you turn the ignition key on and do not hear the fuel pump running for 5 seconds, replace that oil pressure sensor. That sensor does turn the fuel pump circuit off once oil pressure is acheive and the the computer switches the fuel pum relay on to take over running the fuel pump

The primary (coils) side of the fuel pump relay is powered by the CRANK fuse (10 Amp) located in the instrument panel fuse block. This fuse is hot ONLY when the ignition switch is in the CRANK position. The secondary (contact) side of the relay is powered by the ECM-B fuse (20 Amp) which is hot at all times. This fuse is located in the engine compartment fuse block. The electric fuel pump in the tank only operates during engine cranking.

try disconnecting the battery and leaving it disconnected for a while, then reconnecting it. this usually resets the computer.

if there is no power to the fuel pump check relays and fuses....UNDERHOOD FUSE & RELAY PANEL IDENTIFICATION Fig. 2: Underhood Fuse & Relay Panel Identification Courtesy of ISUZU MOTOR CO. Fusible Link Identification ? A - 80 Amp (1991-92 3.1L) ? A - 60 Amp Main-1 ? B - 30 Amp Main-2 ? C - 30 Amp (1993-94) ECM (3.2L) ? D - 30 Amp Condenser Fan (A/T Models) Relay Identification ? 1 - Headlight Relay ? 2 - A/C - Heater Relay ? 3 - Starter Relay ? 4 - A/C Compressor Relay ? 5 - Charge Relay ? 6 - Fuel Pump Relay ? 7 - ECM Relay ? 8 - Wiper Relay Fuse & Circuit Breaker Identification ? 1 - 15 Amp (1991) ECM, Fuel Injection System ? 1 - 15 Amp (1992-94 2.6L) ECM, Fuel Injection System ? 1 - 10 Amp (1992-94 3.1 & 3.2L) Heated Oxygen Sensor, Fuel Injection System ? 2 - 20 Amp (1991-92) Fuel Pump ? 2 - 20 Amp (1993-94 2.6L) Fuel Pump ? 2 - 15 Amp (1993-94 3.2L) Fuel Pump ? 3 - 10 Amp (1991) ? 3 - 15 Amp (1992-94) Turn Signal Lights, Hazard Warning Flasher Lights ? 4 - 10 Amp Horn, Door Locks ? 5 - Not Used (1991 3.1L) ? 5 - 10 Amp Charging System, Charge Warning Light WARNING: Always disconnect battery ground cable before servicing "high- current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician. Page 1 of 2 FUSES & CIRCUIT BREAKERS -1994 Isuzu Rodeo LS? 6 - Not Used (1991) (1992-93 2.6L) ? 6 - 10 Amp (1992-94 3.1L & 3.2L) A/T Interlock System ? 6 - 10 Amp (1994 2.6L) Heated Oxygen Sensor, Fuel Injection System ? 7 - 20 Amp Heater/Air Conditioning Blower Controls ? 8 - 10 Amp Air Conditioner Compressor Controls ? 9 - 10 Amp Right Headlight ? 10 - 10 Amp Left Headlight © 2008 Mitchell Repair Information Co., LLC.

Underhood fuse block swap out relay #7 thats the ECM relay.
Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location.
Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

Have you verified voltage at the fuse and fuel pump relay. There is one fuse in the underhood fuse box.
Let me know.
Regards,

Check your o2 sensor harness. The harness if not properly secured will rub on the axle to a point where it rubs through the insulation of the wire & shorts on the axle causing the ECU fuse (20A) to blow. Repair the harness & replace the fuse & bada bing! You should be in business! Hope that works. IF NOT follow this K.I.S.S.

Keep It Super Simple! It never fails!

Did you verify that the relay terminals have the appropriate signals to them? 

ECM fuse B (20-amp) should provide power at all times to the orange wire of the fuel pump relay. The relay coil receives ground via the black wire, and relay coil gets power from the dark green/white wire. When the relay is closed, you should have battery power on the gray wire. 

The relay trigger wire should have power from the dark green/white wire in terminal 1 of the Vehicle Control Module (VCM) connector for the first couple of seconds after they key is turned to run (to prime the system) and when the truck is running. Checking for all the appropriate signals at the relay is where I would start. That is after I checked for diagnostic codes.

Believe the fuel relay is the middle relay out of the three in the left rear of the glove box. Last thing is to hot wire the fuel pump if you can not get it scanned, see if the pump is bad unless your going to have a shop work on changing the fuel pump.
Good luck and hope this helps. keep me posted.