Fuel problem s4 b5 Reward for help !

[auditrackspeed]

Hello people thanks for reading ! I have 2001 s4 after it sits for 5 to 10 hours it has a hard time starting . Takes about 5-10 cranks then once it starts it bogs for about 2 mins then after that it runs fine no check engine light or faults . after it starts after 10 cranks or so it smells like gas very bad also/

when i get it started after sitting , after 10 cranks . i can turn it off ( after the 10 cranks then it starts ) and turn it on and it starts right up just one crank

already changed fuel filter pump is good too

if your help fix my problem ill send you money paypal

[zillarob]

My guess would be fuel psi bleeding down (pump, fpr, inj) or cts.

[auditrackspeed]

when i get it started after sitting , after 10 cranks . i can turn it off ( after the 10 cranks then it starts ) and turn it on and it starts right up just one crank

[AudiTechS4]

well it can be a few things for sure
fpr bellsing fuel back to the tank.
injector leaking and bleeding down into a cylinder ( mist likely seeing how you smell gas when it finally starts- filling a cylinder with fuel and bleeding down the pressure.)
you can pull your rail up and cycle the key - DONT TRY TO START . cycle a few times and watch to see if an injector is leaking

[auditrackspeed]

hey bro thanks but i thought your fpr is good if its not leaking fuel? my fpr is not leaking fuel

[syxxty]

Had the same problem a few months ago... Installed a check valve after the fuel pump (in the trunk) and solved the problem. Fairly common, especially if fuel pump is after market that doesn't have an internal check valve.

[auditrackspeed]

so dont check for leaking injectors ? i took out all spark plugs they were all dry my next step was taking off fuel rail and check injectors for leak.

what is a check valve never really replaced anything on the fuel system before besides the filter Thank you , Phil

[zillarob]

There is an internal check valve in the pump that holds psi in the system.
If it is bad, it will bleed fuel psi and not be ready to fire when you hit the key.
In my exp, they usually start right up on the 2nd key cycle though.

[auditrackspeed]

so what do you think it is personally ?

[EricVonHa]

Rob has it nailed. The factory fuel pumps had the return check valve built into the pump. If the car has an aftermarket pump, the check valve may or may not be there. It is easily added to the return line at the lid of the tank (under the trunk carpet, pass side)

[auditrackspeed]

thanks so much Eric love you bro ! i waisted money on a new fuel pressure regulator , i have put a new fuel filter in . Just ordered a new fuel pump , so hopefully the new fuel pump fixes it im 80% sure it will !