94 jetta fuel pump wont work

Have you checked for power to the pump from the fuel pump relay.After the key has been off for 10 seconds,turn it on and there should be a short 2 or 3 second pulse of power from the relay and you should also hear a click there.If there is no power pulse,is there power to the relay?Remember the relay only primes the fuel system and the oil pressure switch keeps power to the pump when it sees oil pressure.Is there power at all times to the oil pressure switch?On these vans the wire from front to the pump can go bad,quite a few have had a new wire run for the pump over the years.A great van.

If you have no fuel pressure at the engine when key is on, the pump is not coming on. Check fuel pump fuse, check fuel pump relay (relay should click when key turned to on-put finger lightly on it and feel for click when someone turns key to on). If no click, signal from computer may be lost, ground for relay may be lost, or relay may be bad. If it clicks, wiring from relay to pump may have failed, or the relay's main power source may not be there at relay-find the fuse link or maxi-fuse that powers that relay. One terminal at relay should be hot at all times-can check for that with a test light.
If pump is working and you do have fuel pressure, you will need to check injector circuit. Post back if questions, or need further help.

When you turn the key on it will only energize the fuel pump relay for two seconds , or until you crank the engine over . The PCM - engine computer controls the fuel pump relay . Watch this video
Fuel Pump Electrical Circuits Description and Operation

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

check timming belt and it it is not turning this is your problem and if so this is zero clearence motor so there is also probley more dammage done to the motor

Fuse , relay , fuel pump , check these in that order.

Good Luck !

If you bypassed the relay and the pump ran, have you checked the relay is getting power, if it is then is then does the relay need replacing? if the relay clicks but there's no power on the output terminals has a fuse gone?

If the fuel pump has power it may be a bad ground clean the plugs contact with electric contact cleaner it comes in a spray can. spray the inside of the plug and plug it on several times to rub off any corrosion on the plug and its contacts. By the way if the pump has power to it the relay is working when you turn the key one you can hear the fuel pump relay click.

If you're car has been running fine, then suddenly won't start, the cause is frequently that the fuel pump cutoff has been tripped. Open your trunk, and look for a label for a fuel pump cutoff switch. Locate the switch, press it in, and see if the engine will start.

you know the relay works, you checked it, make sure you have power going to the relay and power at the pump