Aston Martin DB7, DB9, DBS, Vantage V8, Vanquish, and Classic models

Check Fuel system check emission DB9

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Old Jul 6, 2020 | 07:54 AM
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Dean, I don't recall if you're in a coupe or a volante, but in either case, a tech can get into your fuel tank without dropping the tank. I read some threads where people seemed to suggest this couldn't be done in a coupe, but it can. A tech can also check your vapor management valve under the vehicle to see if it's filled with liquid fuel pretty easily, which would be a good indicator that your evap system has a crack/tear in it somewhere. I guess my point is you don't have to throw a ton of money at the problem just yet, as the fuel tank IS accessible so your tech can get positive ID of a problem area before committing to a full repair.

Problem is that even if you have just a small crack in your evap lines on a $100 part, it's likely flooded your system and corrupted other components like a carbon canister, which are very difficult to access as they sit on top of the fuel tank (not inside it). Just something to be aware of if they find a fault in the evap lines.
 
Old Jul 6, 2020 | 08:26 AM
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Thanks again mate, I've got a coupe. Speaking to the tech today we're going to get the codes read at the AM dealer and possibly have a look in the fuel tank. Really appreciate your input, every bit helps
Cheers Dean
 
Old Jul 27, 2020 | 11:51 PM
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Hi Guys, just a quick update. I'll start by saying like most people, my pockets (especially at the moment) are not real deep so my mechanic is aware of this and rather than throw a whole heap of expensive parts at it, he is trying to eliminate the relatively easy and cheap options first, LOL I said Relatively.
Last week he got into the fuel tank, took video of the inside of the tank and removed the filters to backflush them, the filters are 400AUD each here so that is why he didn't just replace them, he said the filters where fine (they are supposedly "lifetime of the vehicle" items anyway, ahem, ). The fuel pumps are less than a year old so we are not going to screw with them at the present, yes I know elsewhere on this forum someone had a new faulty pump. There was no sign of any cracked emissions type pipes in the tank either.
The AM dealer here has read the codes and its fuel rail pressure on the left bank (P0087 Fuel rail/system pressure too low). Anyway, he put everything back together, drove it around a couple of days and just before he rang me to come and collect it, yes you guessed it, the fault happened again. We (I have some mechanical knowledge) are both of the opinion it's an intermittent elec/computer fault due to the fact it runs like an absolute bag of poo until you stop, take the key out, and re start it at which point it runs like a Swiss watch., with that in mind he has gone for the next cheapest option which is a fuel pump driver, en route from Scuderria parts. When he pulls half the back of the car apart to replace this he will also check out the earthing points, another prime source of trouble on our wonderfully hand assembled cars
Stay tuned
 
Old Jul 29, 2020 | 11:08 AM
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Thanks for the update. I'm sorry you're dealing with all of this, but if it's any selfless form of gratification, once you figure this out you will have a great fix to share with the community in case another AM owner runs into a similar issue. Please keep us posted.
 
Old Jul 31, 2020 | 09:36 PM
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Hi

I drove my car for about 125 miles and check fuel system with limp mode is back.
I eded up using old fuel tank gasket as i did not have new one on hand and there is little bit of fuel tank leak on the top so dont know if thats the problem or is it Fuel pumps driver module which is needed.

I am waiting update form deanoroger ?? did you get your car fixe?

 
Old Sep 25, 2020 | 09:06 PM
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Update (of sorts)
2 months later fuel pump driver has still not arrived, ordered through local AM dealer, bad luck if this was my daily driver.
After my mechanic pulled the inspection plate off the fuel tank, removed the fuel filters and had a dig/look around and replaced everything, I had a fuel smell in the car, not cool. Phoned him and as usual nothing was too much trouble, just bring it back and I'll check out the seal on the inspection plate. Note : after he did all of the work on the fuel tank, the fault only returned once and was check fuel not check fuel and Emissions.
​​​​​​So he pulled the inspection plate off (surprisingly easy from the boot/trunk) and sure enough, the seal was split, not completely broken but enough that when fuel was sloshing around in the tank, to cause the smell. Off goes my mechanic to find a new seal and me to Bunnings (I think you Yanks have home depot) to get a seal for the inspection plate cover. We reconvene and he has a seal that will do the job until a genuine one arrives, probably in 6 months judging by the fuel pump driver
Put it all back together, fuel smell now gone, happy happy. Now the clincher (I'm touching wood as I speak, no, not THAT wood lol) the check fuel fault has not returned in the 6 drives since, just before I took it to the workshop for the original lot of work, it was faulting almost every drive, plus getting the check emissions to boot. SO, did all the work he did have an effect on the fault and then the one and only fault since was due to the fuel tank not being sealed properly? And then with the tank sealed properly the fault is gone?? Being an eternal cynic I'm not convinced but knowing this car can throw up faults for a petrol cap being faulty or not screwed on properly I'm starting to think (actually hope like hell) that this could be the case. The only problem with my theory is "why did the fault only ever appear on the left bank" if it was a fuel tank issue? Is it possible the mechanic disodged/cleared something out of the left bank fuel filter? (which is supposedly a "for life" part lol) All of the above said, if the fuel pump driver ever arrives I will still get it fitted.
Stay tuned

 
Old Sep 25, 2020 | 09:28 PM
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Thanks for update .
after I replaced fuel pumps , my fuel tank seal is leaking too and I have smell of gas in the car.

official procedure says anytime one opens the fuel tank access panel AM Recommends replacing fuel tank seal.

I plan to get fuel driver and fuel seal order together once I get update from you .
 
Old Sep 27, 2020 | 09:52 PM
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Db9 limp mode issues p087 low or loss of fuel pressure randomly

Thanks, I will check that in the morning!
 
Old Oct 17, 2020 | 12:49 AM
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So, after nearly 3 months we cancelled the order with the useless AM dealer and ordered one from Aston Martin bits, it arrived in 2 weeks Since I have owned the car, and since we sorted the fuel tank seal, this is the longest I've gone with no faults, roughly 3 months driving at least once a week. Taking into account the amount of work required to get the driver in and out, and on the advice of the mechanic, I am not replacing the fuel pump driver, for now. Knowing these things can throw up a check fuel or check emissions code for something as simple as a faulty or incorrectly fitted fuel cap, I'm starting to believe the original work carried out by the mechanic and the subsequent repair/replacement of the fuel tank inspection plate seal has sorted the issue. (that and the replacement of the fuel pumps last year). So as I'm typing this I have my fingers crossed its fixed.
Stay tuned.......
 
Old Oct 24, 2020 | 12:37 AM
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Yep, too good to be true ​​​​​​
Happened again yesterday and although it all cleared and ran faultlessly for the rest of the day, it really gave me the s hits
So off to the workshop next week to get that fuel pump driver module fitted.
Stay tuned
 
Old Nov 3, 2020 | 07:13 PM
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waiting for update. could you please take some pictures of fuel pump location so i know what to open. looks like its in footwell of rear driver side seat.
 
Old Nov 4, 2020 | 05:08 AM
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Has anyone tracked down an alternate source for the fuel tank gasket? It looked like a Jag S type, but it would be nice to confirm.

Thx,
Larry
 
Old Nov 4, 2020 | 05:36 AM
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Originally Posted by AM4884
Has anyone tracked down an alternate source for the fuel tank gasket? It looked like a Jag S type, but it would be nice to confirm.

Thx,
Larry
I am also trying to figure that out. I wonder if it matters as long as it’s approx diameter like original one and not thinner than original , thicker might be still ok.

if any one has dimension of the Sadler post it please
 
Old Nov 13, 2020 | 07:33 PM
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Hi Guys, had the fuel pump driver module replaced a few days ago and as you'd expect with anything British made/designed, it wasn't straightforward. Let me start by saying I have 100% faith in my mechanic, AM trained, 7 years at AM dealership and very honest. So he pulled half the back of the car apart (inside) subwoofer rear seats etc to discover that the poms, God bless 'em, decided to move the driver on the update model from somewhere in the bowels of the rear seat area to the wheel wells. My guy phoned his old employer, the local AM dealer and nobody there knew about this change. Long story short he said had he known this he could have changed out the part in just over an hour, instead of 5. Luckily he didn't charge me for all of his extra labour. He also changed the fuel rail pressure sensor to the other side so if this problem continues, and changes to the other bank, we'll hopefully know what to replace.
Have done a 100 or so Ks and a number of stop/starts without issue so far but that means nothing as if you read one of my posts above I went nearly 3 months without a problem before the driver was changed.
Unfortunately I was unable to get photos but like I said, it's in the rear wheel well so I assume it's a case of removing the wheel and then the inside cover (I'll try to remember to ask next time I talk to him)
 
Old Nov 13, 2020 | 10:12 PM
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Originally Posted by Wildcat1212
I am also trying to figure that out. I wonder if it matters as long as it’s approx diameter like original one and not thinner than original , thicker might be still ok.

if any one has dimension of the Sadler post it please
I tried Dorman gasket from auto part store and it’s different shape but same diameter. It seems to work no fuel leak or smell.

 


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