[s-cars] 95.5 S6A fuel pump check valve failing (now new pump not pumping....)

[Tom Green]

On some of the replacement pumps there is a plastic plug on the inlet  
that must be removed.  I have not seen one on the Bosch pumps,  
though.  If you have power to the pump you should be able to hear it  
run.

I would try a little priming at the intake manifold to check.

Tom

On Thursday August 2, 2012, at 11:36 AM, "McCall, Randy" <rmccall at nexant.com 
 >  wrote:

> Took the list advice and just finished installing a new Bosch fuel  
> pump, with pressure regulator and fuel filter done last week.  
> Started last week with the simpler task and first changed the FPR  
> and filter - no difference in behavior and starts were delayed until  
> fuel pressure built back up after shut downs for more than 10  
> minutes.  Ran the car nearly out of gas last night and took the  
> plunge and removed the original fuel pump - a string of rubber  
> gasket between the metal fuel pump body and the top plastic were  
> hanging to the side when I removed it, so it was clearly a problem  
> waiting to happen.
>
> Today I finished the re-install of the pump and added a couple  
> gallons of gas, reconnected the battery, re-installed fuse 17 for  
> the FP relay, and tried to start - nada.  Kept trying for a long  
> time and still no fire.  Cracked open the line to the fuel filter  
> and I got no pressure or signs of fuel at the filter yet.
>
> I hooked up the new FP identical to old, but used the new Bosch  
> spade connectors and snap in holder - green to the "+" side, brown  
> to the "-" side.  Seated the pump so that both clips were holding it  
> down.  Any ideas or suggestions on diagnosing this new problem?
>
> Thanks,
>
> -Randy
>
> Date: Fri, 20 Jul 2012 22:47:06 +0000
> From: "McCall, Randy" <rmccall at nexant.com>
> To: "s-car-list at audifans.com" <s-car-list at audifans.com>
> Subject: [s-cars] 95.5 S6A fuel pump check valve failing
> Message-ID:
> 	<A8BD3D2436B19441B900A3347FDC164D139986EE at SACEXCH02.nexant.corp>
> Content-Type: text/plain; charset="us-ascii"
>
> I've been driving relatively trouble free for too long apparently!   
> My 95.5 S6A has recently started showing signs of hard starting -  
> after it shuts down the cranking time has now gone way up.  I at  
> first though perhaps the CPS was going south with some of the first  
> hot weather we've had here in the Willamette valley, but I'm now  
> more convinced that it's the check valve that isn't holding pressure  
> in the fuel lines.  Car runs perfect once it gets fuel, but takes  
> several tries to get it to kick off after I've driven and shut the  
> car off for more than 10-15 minutes.
>
> This is a chipped car with about 175K on the original fuel pump - 
> presumably, as I don't have records of it being changed prior to  
> when I bought it at about 92K.  Probably time to do a FP before it  
> also fails...Any consensus on whether to replace the fuel pump with  
> stock instead of other aftermarket choices, and does a stock FP  
> include a new check valve?  Relaying the FP could be part of the  
> replacement process as well as I see that is often a recommendation.