2011 jetta cjaa- p0087 after hpfp replacement **problem solved**

[johnf45069]

Hi I'm having a p0087 low fuel pressure code after replacing hpfp. It triggers everytime I rev the car past 2300 rpms. Until that point it runs fine. I can drive for 1hr with no problems as long as I baby it. I have been driving with my code scanner attached and deleting code but everytime the cruise control has to rev up for a hill it happens. The auxiliary pump is also making noise.

I bought the disaster repair kit. I have done the following.
*new hpfp
*all new injectors
*new hard lines& rubber lines
*some hard lines and rubber cleaned
*flushed tank
*flushed return and feed lines
*new filter housing and filter
*new return lines from injectors including round plastic inline valve(not sure of name)
* new auxiliary pump(replaced twice thru warranty)
*new in tank fuel pump (replaced twice thru warranty)
*had vw dealership encode injectors
*new fuel rail and sensor
* I looked all over the car and cant find any leaks anywhere.
*primed the auxiliary pump and in tank pump for 2 60 second cycles everytime I opened the fuel system
*I also double checked timing after issue occured.
* I cant find any metal shavings in the system


When i originally fixed hpfp failure i drove to work with no issues for 45mins as i normally do around 75mph. Then the light came on. Car seems to be putting it in limp mode/rev limiting until i clear the code. I would appreciate anyone who can help me shed some light of this situation.


-thank you

 

[Shoveltrev]

if the aux pump is making noise the system is propagating air somewhere between the tank and the aux pump. or the intank pump isnt running . both of these issues will give you a p0087. was probably what killed the original injection pum. see this allllll the time.and on my personal vehicle. . the tank pump harness was pinched under the carpet.

 

[johnf45069]

I dropped the car off today at a non-dealership mechanic . I'll keep the thread updated on what they say.

 

[johnf45069]

Pickup up car today- repair order says mechanic placed hand on fuel line during inspection line popped off. Reattached line fixed lol. Drove it the 25 mins home code popped back up. I've got to call them back tomorrow to see if I can drop it back off.
When I got it home I checked the fuel pump in tank is running.the original pump made it to 130k. I've never heard the auxiliary pump make this noise in the 40k miles I put on the car.

 

[oilhammer]

Dumb question: are all the lines on the correct way? Not sure if it could happen, but if a return and feed line was swapped somewhere.... (saw it on a Nissan once).

That aux pump noise does seem like air or some restriction might be happening.

Also, did you replace the little plastic prefilter screen that goes right before the HPFP inlet? That little plastic nub on that hose assembly has a very fine screen inside of it. If that gets plugged up, you'll have issues. It can even get plugged up AFTER you've fixed the car, with some residual stuff. Really cannot see it inside, but if you take it off the car completely, and blow compressed air backwards through it against a white paper towel, you can see if any gray stuff comes shooting out.

 

[JETaah]

I ran into the swapped "in" and "out" fuel line right at the lift pump once. Engine was making a noise after it ran a while and got codes for low rail pressure. Worth a check. Black line goes to the engine, blue is return to the tank.

 

[johnf45069]

*problem solved * I went back over the car agian. I had the feed and the return line swapped at the in tank fuel pump. Noticed the little arrow with an "R". On top of pump. Thanks for all the advice

 

[oilhammer]

Hehe.... you're welcome. Glad you got it fixed!