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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Thu Jun 10, 2021 4:46 pm Post subject: Milky gas after fuel pump |
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Hello all,
Got stuck with my 91 2.2 over the week-end. Thought it was another fuel pump issue so I replaced but no luck! While testing the fuel pressure, I realized that gas was milky looking after the pump. Is it normal since gas is badly shaken in the pump or it is not normal? Next step for me to check is the Subaru regulator since the fuel pressure was ok at 30 psi.
Thanks for any input
GB |
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shagginwagon83 Samba Member
Joined: February 07, 2016 Posts: 3800 Location: VA/TN
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Posted: Thu Jun 10, 2021 5:21 pm Post subject: Re: Milky gas after fuel pump |
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I don't know if this is why it is milky, but water can get into your gas through the overfill gas expansion tanks in your front wheel wells. _________________ Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan |
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AndyBees Samba Member
Joined: January 31, 2008 Posts: 2331 Location: Southeast Kentucky
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Posted: Thu Jun 10, 2021 6:17 pm Post subject: Re: Milky gas after fuel pump |
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Could be sucking a very small amount of air! _________________ '84 Vanagon Tin-top, ALH TDI. 1989 Tin-top
1983 Air-cool, 225k miles, 180k miles mine. Seven trips to Alaska from 1986 thru 2003. |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32625 Location: Reading Pennsylvania
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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Thu Jun 10, 2021 6:54 pm Post subject: Re: Milky gas after fuel pump |
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Thx for the answers.
I did fill clear plastic bucket yesterday and all liquid was clear this morning.
Seems like no layer so probably air.
So I conclude that this is not normal. I will check all connections.
Could it be the reason of my lost of power that I thought was the fuel pump or the fuel pressure sensor?
Thx again.
Gaetan |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32625 Location: Reading Pennsylvania
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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Fri Jun 11, 2021 5:38 pm Post subject: Re: Milky gas after fuel pump |
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Hello,
Tank is about half full!
I will reconnect the hole thing this week-end and see if my lost of power is still there.
Thx
GB |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50347
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Posted: Fri Jun 11, 2021 6:10 pm Post subject: Re: Milky gas after fuel pump |
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Pichenotte wrote: |
Hello,
Tank is about half full!
I will reconnect the hole thing this week-end and see if my lost of power is still there.
Thx
GB |
If your fuel tank ventilation system is clogged it can cause the pump to draw a vacuum on the tank and associated line and will of course suck air in through any possible location. |
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Witless Joe Samba Member
Joined: May 06, 2005 Posts: 460
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Posted: Fri Jun 11, 2021 9:16 pm Post subject: Re: Milky gas after fuel pump |
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Indeed.
Also, how old is the gas tank?
If this is an old, rusty tank, full of crap at the bottom and partially clogged with rusty smegma, the same thing will happen.
Clogs in the supply circuit will force a fuel pump to suck air in from any weak spot along the line that would not normally be a problem.
Wildthings wrote: |
If your fuel tank ventilation system is clogged it can cause the pump to draw a vacuum on the tank and associated line and will of course suck air in through any possible location. |
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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Mon Jun 14, 2021 5:22 pm Post subject: Re: Milky gas after fuel pump |
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Hello all,
Thx for all the advices.
Fuel comes from tank clear and high flow.
Reconnected everything and check fuel pressure just before fuel rail and get about 35 psi.
Still does not start (again this is a 2.2 Subaru)
Next move is to replace fuel pressure regulator unless someone knows how to test it with engine just cranking.
Thx again.
Gaetan |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50347
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Posted: Mon Jun 14, 2021 5:51 pm Post subject: Re: Milky gas after fuel pump |
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Pichenotte wrote: |
Next move is to replace fuel pressure regulator unless someone knows how to test it with engine just cranking.
Thx again.
Gaetan |
By verifying that you have 35 psi of fuel pressure, you pretty much did verify that the FPR is doing its job. |
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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Mon Jun 14, 2021 6:02 pm Post subject: Re: Milky gas after fuel pump |
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Thx Wildthings,
Then I don't know where to start from!
As I wrote in the beginning, it all started on the road like the few occasions where the fuel pump died. Lost of power until I replace the pump.
Now with the new pump, it does not even start.
Should I check first if spark plugs spark? Is it like a good old sled where you remove the plug, make contact with the block and crank to see if there are sparks?
Gaetan |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32625 Location: Reading Pennsylvania
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50347
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Posted: Tue Jun 15, 2021 3:19 am Post subject: Re: Milky gas after fuel pump |
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Pichenotte wrote: |
Should I check first if spark plugs spark? |
Checking for spark would be an obvious step. |
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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Tue Jun 15, 2021 6:28 pm Post subject: Re: Milky gas after fuel pump |
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Hello,
Quick update.
I do have sparks and pump runs fine since I do have 35 psi.
There was no sign of unburned fuel on the spark plug I removed so I suppose the injectors do not send fuel.
Will try replacing FPR.
Gaetan |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50347
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Posted: Tue Jun 15, 2021 8:22 pm Post subject: Re: Milky gas after fuel pump |
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Pichenotte wrote: |
Hello,
Quick update.
I do have sparks and pump runs fine since I do have 35 psi.
There was no sign of unburned fuel on the spark plug I removed so I suppose the injectors do not send fuel.
Will try replacing FPR.
Gaetan |
You need to verify if the injectors are getting a signal to fire. You need to acquire a node light or some way to see if if there is a signal. The injectors get power through the FI relay and fire when the ECU grounds the other lead on the injectors.
As I said before if you have 35 psi the regulator is doing its job. |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32625 Location: Reading Pennsylvania
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Pichenotte Samba Member
Joined: September 29, 2015 Posts: 17 Location: Quebec, Canada
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Posted: Mon Jun 21, 2021 5:21 pm Post subject: Re: Milky gas after fuel pump |
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Hello,
Finally had some time to continue my trouble shooting!
I do have a signal to trigger the injector (test light from battery + to ground wire of connector and light flashing while cranking.
So now I am lost.
I planned to replace fuel pump with new one in case it is defective even if I do have about 35 psi and flow.
Any idea what to try next?
Thx
Gaetan |
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djkeev Samba Moderator
Joined: September 30, 2007 Posts: 32625 Location: Reading Pennsylvania
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