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-   -   Ran out of gas...refilled and won't start..HELP (http://www.defendersource.com/forum/f6/ran-out-of-gas-refilled-and-wont-start-help-46640.html)

tebby July 3rd, 2013 12:45 PM

Ran out of gas...refilled and won't start..HELP
 
Just ran out of gas...I know what jackass runs out of gas....was fortunate enough to coast into my local gas station where I buy 93 octane 100% gas (ethanol free). After refilling...won't start and stay running. Only runs for about 5 sec. Mechanic sprayed some gunk cleaner and it would run as long as he sprayed...as soon as he stopped truck would stall. Can hear my relays clicking on the fuel pump. They're gonna try flushing out the fuel filter with compressed air....hope this works. Mechanic thought it may be the fuel pump....randomly went out the same time I ran out of gas? thanks for any insight

Jymmiejamz July 3rd, 2013 12:47 PM

You could have just been low on fuel, and the fuel pump failed.

fishEH July 3rd, 2013 12:59 PM

First verify that the fuel pump is running. If it isn't then its probably not a coincidence that it crapped out. When you run your truck till it runs out of fuel the last thing that went through your fuel pump was any sediment that was on the bottom of the tank. Running it dry and sucking that sediment could've been what killed your pump.

Red90 July 3rd, 2013 01:21 PM

Can you hear the pump running for a few seconds when you turn on the ignition?

woldd90 July 3rd, 2013 01:27 PM

Could you have run the line dry and now have an air bubble?

belgian July 3rd, 2013 01:34 PM

I hope you solve the problem fast! My brother was impressed when he saw your truck in Blacksburg!

tebby July 3rd, 2013 01:40 PM

There's was a lot of background noise...I removed the seat and could hear the relays clicking but I'm not sure if I could hear the pump....I'll check and see if I can hear it. fishEH...thats what I'm afraid of! woldd90...that would be great.

its been a little while since I've posted anything due to starting a business....I absolutely love this site...thanks for all the help guys!!!

tebby July 9th, 2013 10:37 AM

NO power to new fuel pump.
 
New fuel pump...but no power. I'm pretty certain my silver bosch relays under the passenger seat are fine. Why aren't I getting power to the pump?

leastonce July 9th, 2013 10:40 AM

disconnect the battery ... it will reset the ECU ... send me paypal as thanks! ;-)

tebby July 9th, 2013 12:22 PM

1 Attachment(s)
Reset ecu....still no power to the purple/white wire to fuel pump

Also no power to the blue/white wire to this. Is this the fuel pump kill switch?

Attachment 75584

What's next?

tebby July 9th, 2013 12:46 PM

The pump was actually fine. But the mech can't get power to the pump....he thinks it has something to do with the switch pictured above.

rovertek July 9th, 2013 12:46 PM

yes .....Inertia Switch ... jump the switch will eliminate that idea
check the fuel pump relay for power should have 2 legs of power one from ecu with key turned on and steady power on the other leg

fuel pumps do not like to be run dry especially rover ones ...

leastonce July 9th, 2013 12:55 PM

Have you checked the fuses ?

tebby July 9th, 2013 01:00 PM

The fuse to the fuel pump doesn't have power. He replaced the fuse...and he showed me when he put a tester on the fuse there was no power.

leastonce July 9th, 2013 01:24 PM

So the fuel pump only gets brief power when you first turn on the ignition ...

Fuel Pump Relay
The fuel pump relay is located next to the main relay. The ECM provides power to the fuel
pump, HO2S heaters and purge valve through the fuel pump relay. The ECM operates the fuel
pump for one second at key on and then when it senses a crank/run signal from the ignition
system


see this document page 89

http://p38arover.com/rover/p38a/Engi...UX_Systems.pdf

psykokid July 9th, 2013 01:38 PM

Try jumpering the fuel pump relay and see if that gives you power to the fuel pump.

leastonce July 9th, 2013 01:45 PM

Quote:

Originally Posted by psykokid (Post 451706)
Try jumpering the fuel pump relay and see if that gives you power to the fuel pump.

It will only run for 1 second to prime the fuel rail pressure ...

Willh July 9th, 2013 01:55 PM

If you haven't seen it already, see post below:

http://www.defendersource.com/forum/...uel+pump+stops

psykokid July 9th, 2013 04:06 PM

1 Attachment(s)
Quote:

Originally Posted by leastonce (Post 451708)
It will only run for 1 second to prime the fuel rail pressure ...

Under normal operations yes, most modern EFI systems do this until the ECU receives an input signal that the engine is cranking.

What i'm talking about doing is making a jumper wire to connect the hot terminal (term 30, purple wire/white tracer) of the relay socket to the fuel pump lead (term 87, white wire/purple tracer) to bypass the relay and test that way. Test with a volt meter first to make sure you are getting power to the fuel pump relay. The ECU turns the fuel pump on and off via switching on/off the signal legs of the relay, not the hot and load side of the relay.

Quimbola July 9th, 2013 04:26 PM

Oddly enough my boat (ford gt-40 engine) had the same problem, turned out the relay was bad, even though it was "clicking" with the ignition, jumped the relay and pump fired...bad relay.

Red90 July 9th, 2013 04:35 PM

YOU need to trace the electrical system to find the fault. The wiring diagram and troubleshooting guide in the workshop manual is quite clear to follow.

o2batsea July 9th, 2013 04:40 PM

I think it's the pump.

psykokid July 9th, 2013 04:53 PM

Quote:

Originally Posted by Red90 (Post 451756)
YOU need to trace the electrical system to find the fault. The wiring diagram and troubleshooting guide in the workshop manual is quite clear to follow.

Yes, if you look at the diagram I posted there's not much to the circuit. Fuse, Fuel Pump Relay, Inertia Switch and Fuel pump. If you reset the inertia switch (check it for continuity to make sure its good) and jump the fuel pump relay the fuel pump will turn on if it hasn't crapped the bed. If the fuse is good and you jump the relay and the pump doesn't run then the pump is a goner (likely since you ran it dry). If the pump runs then check the relay by swapping another relay in its place.

tebby July 9th, 2013 06:09 PM

Ultimately replaced pump...still doesn't start. Mech stated he jumped fuse #20 and pump will work. No power present on #20....mech stated it has something to do w solid white wire on #20 fuse....and once he gets power to this white wire it should start. The way I read the diagram the solid white went to ignition switch. Where does this wire get its power?

psykokid July 9th, 2013 06:42 PM

Fuse #20 in the satellite box just supplies power to the switch leg of the fuel pump relay which receives an rpm signal from the alternator to trigger the relay. The white wire from the ignition switch gets its power from the brown wire coming into the ignition switch when it's turned on. Back probe the ignition switch using the brown input line and the white output line and see if its getting power when you turn the switch to the run position.

Fuse #6 is a 15A fuse in the engine compartment fuse box which supplies power to the 30 lead of the fuel pump relay socket.

jhhorse July 9th, 2013 06:59 PM

Just went through something similar with mine, wiring under the truck down range of the fuel relay burnt through (corrosion?) and fried the pump. New pump would not run until wires were run and the troubled wire was replaced.

I have also seen a loose wire on the bottom of the coil shut off ignition and pump, maybe check spark as well as pump.

Joe

psykokid July 9th, 2013 07:24 PM

Have your mechanic check the supply side for the fuel pump like I said HERE buy jumpering the fuel pump relay. If the fuel pump runs that way, then the problem lies in the switching part of the circuit.

sherpamike July 9th, 2013 09:00 PM

I go back to what Scott said at the beginning: air bubble in the fuel line. If I were you, I would try to really prime the hell out of the fuel pump/line/filter/whatever else.

I had the same thing happen to me years ago (6-7 years now?). Truck ran great as a daily driver and I -stupidly- ran it out of gas. I had intermittent stalling and starting issues for a long time after that. During that frustrating period I replaced the filter but never found a real "fix." It just took several weeks of driving and stalling for the truck to drive normally. I haven't had any of those related problems in the years since... And never replaced the pump.

tebby July 10th, 2013 03:28 PM

Problem Fixed
 
The white wire to the ignition switch had burned through. A new section was spliced in and I'm good.


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