V8 engine shuts off after 4 minutes, code P0627-00 (6C) Fuel pump A control circuit/open

[Rover Range]

You can have your local repair facility perform the recall.
Land Rover will reimburse you for the repair costs.
This way you don't have to mess with it.

That sensor may not set a DTC.
You can monitor the low fuel pressure and see if it has any drastic variations.

 

[scapistron]

If it turns out to be a mouse / wiring issue I recommend solder-loaded crimp on butt splices. A nice all in one solution.

 

[gsxr]

You can have your local repair facility perform the recall.
Land Rover will reimburse you for the repair costs.
This way you don't have to mess with it.

If the truck was still running normally, I'd probably consider this for the recall... but right now I'd be stuck paying the indy shop to fix the current shutoff problem, and that's not in the budget. If a new sensor fixes the 4-minute shutoff, then yep, I might look into having the recall done locally and praying they don't screw it up. I've not had good results with repair shops, which is why I do 99% of work myself.

That sensor may not set a DTC.

Ah, good to know - thanks!

You can monitor the low fuel pressure and see if it has any drastic variations.

I can't find any mention of low fuel pressure in the "Live values" menu in GAP IID. What is the name of this value in the menu?

Or do you mean to connect a gauge to the rail and watch actual fuel pressure on the gauge? I do have a gauge, just not sure where to attach it.

 

[Rover Range]

I'm not familiar with the GAP tool.
You can't connect to the rail, that's 25K plus psi.

You would have to tap into the fuel line coming off the fuel tank. There's a connection right at the front of the tank.

 

[scapistron]

Cheap and easy thing that might not work; replace the relay.

 

[gsxr]

Last week I had to get a tow after my alternator was overcharging and voltage spiked something and shut me down while driving downhill. It was code for secondary fuel pump voltage too high. p0232-24 fuel pump A secondary circuit high. General signal failure signal stays high.
It would start, and immediately die. After roll back showed up (20 min) it started and ran normally.
Might sound fruitless, but check your charging system too. Replaced with new JLR alternator and all is good.
Also, the cigarette lighter was dead when it was not starting. Came back on after the 20 min wait for tow.

I connected a volt meter and observed ~14.2v after a cold start. Voltage remained in the low 14's. Although I wasn't watching the meter when the engine died, I don't think the voltage did anything funky. I think the alternator is OK for now, there were no other codes or voltage-related weirdness.

I'm not familiar with the GAP tool.
You can't connect to the rail, that's 25K plus psi.

You would have to tap into the fuel line coming off the fuel tank. There's a connection right at the front of the tank.

I couldn't find easy access to the fuel lines anywhere. Sure would be nice to have a threaded fitting to connect a manual gauge. I'm pretty certain that the pressure / flow is stopping, which causes the engine to die, but it would be nice to see that on a gauge. Seems crazy that JLR has a sensor on the low pressure supply but no way to read the pressure OR voltage from the sensor, via GAP IID.

Cheap and easy thing that might not work; replace the relay.

Tried that first thing (see post #1)... swapped relays, no change.

 

[gsxr]

The new low pressure sensor arrived yesterday from FCP (link), appears to be OEM and made in Mexico. Replacing that stupid thing is a total b itch of a job due to ZERO access room. There's barely space to fit one hand, let alone 2 hands and 2 tools. I'll post a separate thread with photos, since I couldn't find any details on the procedure for replacement. As a bonus, the claimed location in the FSM (right front wheelwell) is wrong. It's on the passenger side of the transmission.

UPDATE: I created a How-To / DIY thread documenting replacement of this sensor, click here.

Of course... no change. The engine still dies 2-3 minutes after startup with the new low pressure sensor.

I did find the GAP IID live data that shows the requested duty ratio, where up to 50% triggers the pump to run, and a signal of 75% shuts it off. I briefly saw the signal change to 75% right after the engine died. I'll do another cold start today and confirm. This would seem to indicate the pump is shutting off and after the engine dies, the engine control module then sends a signal to cut power to the pump.

Seems like the next step will be dropping the tank. Wish me luck.

 

[MellonRover]

UGGG....sorry gixxer. Sounds defeating. But we love these trucks right.


...uhhh we do right.??...lol

 

[gsxr]

Replacement fuel pump has arrived, other parts are in transit.

New problem: I can't siphon the 20 gallons of gasoline out of the tank. I can insert a hose almost 5 feet down the filler pipe, but the hose won't contact liquid. And it won't go any further than ~4.8 feet down the filler pipe. The V8 FSM is useless, here are the fabulous instructions for draining the tank:

"Remove the fuel from the fuel tank, via the filler neck, using the fuel tank draining equipment. Follow the manufacturer's operating instructions."​

Now, I did find this tidbit in the SCV6 manual, which turned on a lightbulb over my head:

"The fuel filler pipe locates in the tank and incorporates a spitback flap in the tank end of the pipe. The flap is a​

spring loaded cover which acts as a 1-way valve, allowing the tank to be filled but preventing fuel leaving the tank into the filler pipe."​

Is this "spitback flap" present on the V8 tanks also? If so, would it prevent a hose from passing through? I don't have a borescope that is 5' long.

Alternately - is there an anti-siphon feature at the filler pipe/tank junction, as seen in this NHTSA TSB for Range Rovers?

I'd rather not try to remove the filler pipe and take a bath in 10 gallons of gas (until the level is below the filler inlet).

Google, YouTube, and forums have not been any help so far.

Range Rover anti-siphon grille:

 

[Rover Range]

You can remover the filler pipe hose at the fuel tank. Maybe loose about a teaspoon of fuel.
The one way valve in the tank can be pushed open with a screwdriver. Fuel will come out then.