Hello...I just wanted to get a feel for when we should consider changing out the fuel pump on our cars. Is this a forever part or does this perform less as time, age and miles add up?
Anyone had a failure on a 997.1 yet?

 

I guess no one has had a failed pump? That's good to know.

 

Thanks Sam. I was just wondering if it best to just get it changed out since we will be tuning E85 and since available everywhere I will prob run that tune more often than not.

 

Think its somewhere in the $1k range for pumps and pick ups(jets). I have thought of swapping mine out if I try to squeeze more power out in the future just as a precaution. Then I could take advantage and flow test them

 

I do believe it is a "forever" item unless you experience an issue. In my case, I did have a failing fuel pump but it wasn't readily apparent (no CEL but there was a stored fault) that it was happening. I guess this is a benefit of the dual setup!

I actually bought the car with the pump on the fritz and continued to drive it for ~5K miles and a couple years before realizing I needed to address it. Not wanting to get stranded down the road, I went ahead and replaced the unit. Couldn't really tell any difference after it was replaced either. Take a look at the thread I started a couple years ago. https://www.6speedonline.com/forums/...elay-fuse.html for more info.

As an aside, I was originally quoted ~$1100 to have the fuel pump replaced (parts and labor). I ended up sourcing the parts (fuel pump was $388, sealing ring <$10, shipping $100) from Scuderia Car Parts across the pond. Although I was considering R&R myself, I ended up using my local Porsche Indy and they charged $350 in labor, so I saved a reasonable amount going this route.

Part numbers for reference:
Fuel pump: 99762012700
Sealing ring: 99720173300

 

I just replaced mine at 55kms. I had inconsistent pressure at low rpm only.

 

not a forever item both of mine failed and left me stranded, replaced them both,

 

Can anyone share symptoms? I think I may have a problem with the pumps or relays.

 

fuel pressure drops, hard to start when car is hot, long cranking at startup.

 

No real symptoms on my end other than a burned out fuse that would blow every time I replace it. And oh yeah, it showed as a fault if you do a scan.

https://www.6speedonline.com/forums/...elay-fuse.html

 

when fuel pumps are on their way out they draw more amps due to more internal resistance, which is why they keep kicking fuses

 

I don't know but after catching the car "red handed" in the act last night via a log...I am convinced something is off with my fuel supply to the engine. To give context, this was after a 30-40min spirited run after which I got home...parked and went inside for about 10mins. I go back to take a log of it at idle and boom.....car started right up....but short term fuel trim was pinned at 1.25 and there was clicking coming from the left side of the dash. I let it sit idling for a min or two and then rev'd up to 2500-3k rpm...after which I let it go and went back to idle. Clicking stops and fuel trims start going back to normal...

Looking at the log you will notice:


Idle Pre Revs:

RPM: around 750rpm
maf g/s: 5.75 to 6.0 range
map sensor: -9.5psi
throttle angle: 1.5-1.96 degrees
STFT: 1.25
Injection time ms: starts at .80ms and levels down to .68ms



Idle Post Revs:

RPM: around 750rpm
maf g/s: 5.75 to 6.0 range
map sensor: -9.5psi
throttle angle: 1.5-1.96 degrees
STFT: shoots back to 1.20 but then continuously decays to .95-1.0 (normal)
Injection time ms: shoots back to .80ms and levels down to .46ms

Nothing really changed with the car....a vacuum leak wasn't there and then magically disappeared post revs (unless I am missing something)


Only thing that could change (that isn't logged) is fuel amount being delivered to the injectors right?


https://datazap.me/u/turboslut/idle-...10-29-25-23-24


Anyone have any thoughts?

 

clicking sound from left side of the dash would be the fuel pump relay. they are down in the drive kick panel. there is 1 for each pump.

 

Are the relays there or the fuses? I just looked at service manual and it has a crazy procedure to pull out relay carrier 1 from out under the dash. Do you know a shortcut?

 

both relays and fuses are there. you can pull out the relays separately. you have to remove some of the trim pieces around them to access them.