Car runs with out the fuel relay and will start as well is there a problem with the junction block itself

There are 2 fuses one is a 15 amp located in the under hood junction block and the other is marked "ign" in the interior fuse block it's a 5 amp. There are Two relays one is marked Fuel Pump and is located in junction block #2 the other I'm not sure the name maybe ignition or fuel injection anyway it's in JB1.
I hope this helps. Take care.

1) Main Relay
(2) Fuel Pump Relay
(3) Junction Box (located above left side hinge pillar trim panel)

Fuel Pump Relay 2.5 L
Left side of the instrument panel attached to the junction block on the left side

Fuel Pump Relay 2.0 L
Left side of the instrument panel attached to the junction block on the left side

Fuel Pump Relay 1.6 L
Left side of the instrument panel attached to the junction block on the left side

Looking in the wrong place. Just off the battery junction block (like fuse/relay block) under the hood, there is a 20amp in-line fuse for the fuel pump and the ecm. Doesn't say exactly where, but look for a red wire coming off the junction block to this in-line fuse, then it turns into an orange wire going to the fuel pump relay.-this relay is also most likely under the hood.

Make sure you're getting power to the fuel pump after start up. GM cars provide power to the electric fuel pump via the starting circuit when cranking and switch to alternator/battery power via the fuse block and 12v relay with ignition on in run position. Check your fuse block (bad fuse; power not getting to part of fuse block) and fuel pump relay. Could also be plugged fuel filter, bad pump or ?. but not likely because you get fuel while cranking. Check for error codes in the engine control computer (GM OBDII) as well but that probably won't show anything. Good luck and good hunting. I had a similar problem with a Chev Astro. Turned out to be power not getting to one bank of the fuse block because of a burned junction terminal buried behind the battery under the hood. Get out the multimeter and start looking for failed electrical components or broken wires.

Hello freefallcrus
The fuel pump relay for the 2003 f350, is an integral part of the central junction block(fuse box) located under the left side of the dash. So in order to replace the relay, you would have to replace the junction block. Hope this is helpful.

The second junction block (No. 2) is found under the hood on the forward part of the left wheelhouse (driver's side). The fuses, fusible links and relays in this junction block generally control the engine and major electrical systems on the car, such as headlights (separate fuses for left and right), air conditioning, horns, fuel injection, ECM, and fans.

The arrow is pointing to the headlight fuse.

Hello! The fuel pump relay is located on the bottom right of the instrument panel junction block...the junction block is beneath the center of the instrument panel...

Guru.............Saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

The fuel pump relay is located in the fuse junction block,under the hood
on the left fender. There is also a fuel pump+injectors fuse, in the fuse
block behind the left side of the dash. It should be marked f/p-inj.
Hope this helps.

Your vehicle is equipped with two fuel pump relays. Both are located on the junction block which is located behind left end of dash. You will need to test both of them to ensure they are working properly. Let me know how they test out.

There's two fuel pumps, primary in the gas tank and a secondary pump under the car. Try using a jumper wire where the fuel pump relay plugs into to see if the relay is bad. Clean and adjust the airflow plate. Check for rust at the fuel distributor. And check for leaks in the plastic fuel lines from the fuel distributor to the injectors (wrap some paper towels around them and turn the key on to prime the system). Clean the terminals on the fuse panel and wiring harness junction blocks. Look here for more help http://www.saabnet.com/tsn/bb/900/