[V8] Fuel Pump Failure Modes

[urq]

Thanks Shayne and all!
   
  I'm pretty convinced that the pump is noisy enough to be suspect ... VDO replacement from SJMautotechnik should be arriving in the morning.  I'll also open up the FP Relay and spray some contact enhancer in there ...
   
  I saw some comments about the flywheel sensors ... owning 2 V8 5-speeds means I've got a lot of BTDT on them.  For the engine to die while the car is running it would be the speed sensor ... and if the speed sensor fails the tach stops registering ... in my original message I noted that while I was coasting with the engine in gear I confirmed that the tach was registering.  
   
  Steve B
  San Jose, CA (USA)

quattro + 5 or 8 = fun <thequattroking at yahoo.com> wrote:
  steve-

i certainly have had the pump come back to life. on my old 4ksq, when i
drove it daily, i was to poor to afford a new pump when they went out. SO,
i had "pull n save" pumps in my trunk along with the tools to replace the
pump AND, most importantly my pump cpr kit. that consisted of a hammer and
a block of wood. I would put the wood on the pump and beat it with a
hammer. I could usually get 5-10 cpr restarts before it would fail forever.
I am glad i now have a job that pays well and newer cars (although not that
much newer). I still have the 4ksq.




Shayne

> Thanks for the quick replies all!
> 
> I opened up the access panel in the trunk ... this pump is a lot louder than
> the pump in #344 ... I think I'll take my chances that its the pump. I've
> never had an FP Relay fail ... but it may well be a contributor. The fact
> that the car had been running for some time when it lost power would tend to
> speak against the relay ... although, perhaps the contacts got hot. I will
> pull the relay and check the contacts as well.
> 
> Once again ... THANKS!
> 
> Steve
> 
> Jason Wilkerson wrote:
> Steve,
> Had a car that died, waited 5, restarted, drove 2 hours, died, new pump,
> ran for 3 more years. I would let the car idle for an hour or so, when
> and if it dies, check for fuel then go from there. Good luck.