Replaced both pumps car stalls randomly then runs fine

[redzero]

Dear all

my passenger side pump started to whine so I done the relay test and it turned out to be the driver side

pump faulty so I bought the two pumps

and replaced them following the diy I also replaced both flanges on top the black one with the filter and

the white one with the regulator

now my car will randomly stall mostly during warm up or some time in stopping light I opened the tank

and rechecked the connection all seem to be fine .also the time I opened it there was a lot of pressure in

both pumps as I can see both hose going to the filter are priming

any suggestion would appreciated ?

with regards

[EleCTriCT]

direct injection with a high pressure pump?

year? model? engine?

[redzero]

2006 cayenne s

[EleCTriCT]

At this point, I wouldnt throw parts at it, but checks will need to be made based on symptoms..

Checking fuel pressure with a mechanical gauge...

Checking fault codes - durametric

Checking for vacuum leaks etc - Smoke Machine

There are many issues that can cause a vehicle to stall and always possible to have more than one specific problem.

[redzero]

but it was running fine before the pump replacment as long as i keep the tank full

i will do ther pressure check and i will test the pumps one by one

and i will take it to local service to get it scanned for codes and i will report here

thank you

[working4it]

Defiantly check for codes. I would also check the gas cap seal ring along with the check valve line.

[ekstroemtj]

By the way... What is the check valve line?

[redzero]

hi all

to update both maf replaced pumps were fine whats unusual is before pump replacment it was running fine

thank you all