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Old 11-14-2019, 11:29 PM   #1
pyrokidd89
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Default 2016 WRX Fuel pump issue I think?

2016 WRX been running flex fuel for about 25K miles. No issues what so ever. Until last week when sitting at the stop light car starts running rough then dies and won't start. Turns out the fuse for the fuel pump blew. Replaced the fuse and the same thing happens the next day at idle car dies and blew the fuse. This is with a DW300c fuel pump and this was right after I filled up with 93oct so my E content was about 12%.

I took the fuel pump out and noticed the filter was very dirty or at least I think so. picture below. So I replaced just the filter.



I put everything back together and the car ran fine for a run to the store 30+ minutes and then also on my way to work 45 minutes. Then on my way home I noticed my fuel pressure was a little below the target by about 30 psi at idle. when driving its fine. then at a light again it blew the fuse.

I got home and put in the OEM pump that I still had but with the new DW filter cause I don't have the stock filter. car idled fine for about 25 minutes then lost fuel pressure. didn't blow the fuse this time. The pump turns on when I key on and the pressure is about 32 PSI but the car wont start.

I take the whole pump out again just to look at it. I noticed that the canister the pump is in is very dark. and the fuel that came out of it is dark also almost grey in color. Is there some sort of filter media inside this thing? Has anyone else had this issue? I am trying to narrow down if I need a new low pressure pump, replace this housing/filter if it is a filter or is this a hpfp issue?

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Last edited by pyrokidd89; 11-14-2019 at 11:34 PM.
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Old 11-15-2019, 10:04 AM   #2
Rexy18
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Based on having same symptoms with two different pumps id venture a guess that the problem is elsewhere.

Are both hpfp and lpfp working off this fuse that blew once?
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Old 11-15-2019, 10:13 AM   #3
pyrokidd89
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Quote:
Originally Posted by Rexy18 View Post
Based on having same symptoms with two different pumps id venture a guess that the problem is elsewhere.

Are both hpfp and lpfp working off this fuse that blew once?
The HPFP does not have a fuse it is mechanically driven from a lobe on the camshaft.
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Old 11-15-2019, 10:28 AM   #4
Rexy18
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Doh! Sadly i knew that just thinking what else could be blowing the fuse. Anything else running off the same fuse is really what i meant. Otherwise look at wiring. What are the chances of both of your pumps being bad. But at same time blown fuse says you have a definite electrical draw somewhere.

Did you just gas up before problems started by chance?
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Old 11-15-2019, 10:47 AM   #5
pyrokidd89
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Quote:
Originally Posted by Rexy18 View Post
Doh! Sadly i knew that just thinking what else could be blowing the fuse. Anything else running off the same fuse is really what i meant. Otherwise look at wiring. What are the chances of both of your pumps being bad. But at same time blown fuse says you have a definite electrical draw somewhere.

Did you just gas up before problems started by chance?
I did just gas up that morning with 93oct. After filing up my E content was 12% I think it was in the range of 40-50% before that.
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Old 11-15-2019, 10:54 AM   #6
Rexy18
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So now we got another variable, bad fuel. While it cant directly blow a fuse it can make pumps malfunction and pull more current to maintain same pressure? Guessing..

So you have a full tank? Damn.. cuz i was going to say id drain it and get different gas. Syphon some from tank and look at it in a clear glass container. Maybe it is all grey and mixed w water due to a ground leak.. again, just guessing.

Do you have an ethanol vial tester?
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Old 11-15-2019, 11:11 AM   #7
pyrokidd89
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Quote:
Originally Posted by Rexy18 View Post
So now we got another variable, bad fuel. While it cant directly blow a fuse it can make pumps malfunction and pull more current to maintain same pressure? Guessing..

So you have a full tank? Damn.. cuz i was going to say id drain it and get different gas. Syphon some from tank and look at it in a clear glass container. Maybe it is all grey and mixed w water due to a ground leak.. again, just guessing.

Do you have an ethanol vial tester?
I was able to siphon out 5 gallons so that I could do the pump swaps. Looking in the fuel tank it look yellow/green ish. maybe the grey fuel just looked that way cause the pump housing is dark like that. I am wondering if the pump house is a filter also and it is dirty too?
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Old 11-15-2019, 11:52 AM   #8
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I dunno but reg gasoline irritated your dw300c, i aslo run one at 13k now on e51. So perhaps look at how the gas flows thru pump assembly and media and maybe there is a restriction somewhere maybe even a filter media inside this housing if there is one that causes pump to work harder/pull >amps. The high flow perf dw is probably pulling just enough to blow fuse.

Take it apart if you can and inspect i guess, as much as you can.
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Old 11-15-2019, 12:15 PM   #9
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Maybe Subaru Gods telling you to just go back to ethanol? Lol
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Old 11-16-2019, 12:17 PM   #10
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Any progress?
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Old 11-16-2019, 01:02 PM   #11
pyrokidd89
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I ordered a new DW300c at the recommendation of Ron Watson who tuned my car 2 years ago. It should arrive by mid week. I will updated if I have any problems after that.
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Old 11-16-2019, 02:07 PM   #12
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The dirty fuel filter is caused by running ethanol mixes. The gasoline additives and ethanol don't mix well. At least Clark said something along those lines. Probably best to change them every so often when running a blend.
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Old 11-16-2019, 03:18 PM   #13
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Quote:
Originally Posted by pyrokidd89 View Post
I ordered a new DW300c at the recommendation of Ron Watson who tuned my car 2 years ago. It should arrive by mid week. I will updated if I have any problems after that.
I disagree with his assessment cuz both of your pumps produce same results. And it happened after going back to reg gasoline.

But lets hope he is right only cuz that would fix your problems.
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Old 11-17-2019, 05:25 PM   #14
Sillo
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Another aftermarket LPFP having issues. Leave the stock one in people.
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Old 11-17-2019, 06:05 PM   #15
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Another aftermarket LPFP having issues. Leave the stock one in people.
I am not sure it is so simple. He is having same issues with his oem lpfp.
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Old 11-25-2019, 08:12 PM   #16
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How did this resolve or is it ongoing?
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Old 11-25-2019, 08:54 PM   #17
pyrokidd89
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Quote:
Originally Posted by adam99 View Post
The dirty fuel filter is caused by running ethanol mixes. The gasoline additives and ethanol don't mix well. At least Clark said something along those lines. Probably best to change them every so often when running a blend.
Do you have a post or thread where he mentioned this?
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Old 11-25-2019, 08:56 PM   #18
pyrokidd89
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Quote:
Originally Posted by Rexy18 View Post
How did this resolve or is it ongoing?
Sorry to leave you hanging. I installed the new DW300c and have driven about 100 miles on it. I have not been driving as much this week since I am on vacation. I think the issue with the OEM pump was that you cannot get it seated properly with the DW 300c fuel filter. If I don't update this thread again just assume that the new DW300c fixed my problems.
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Old 11-26-2019, 02:49 AM   #19
adam99
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Quote:
Originally Posted by pyrokidd89 View Post
Do you have a post or thread where he mentioned this?
It was on facebook awhile back, cannot find it now
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Old 11-26-2019, 10:49 PM   #20
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Quote:
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Do you have a post or thread where he mentioned this?
https://youtu.be/9ygy2Q1OEE8
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