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Old 01-11-2018, 10:55 PM   #1
PDXREALTOR
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Default How to test a fuel pump - DW65

I have a DW 65 pump in my 17 STI.

One pull it will run as commanded fuel says, the next it will lean out starting around 5k. This is not a one off - it's been going on for a while now.

I have ID1050x and have read the DW 65 can handle anything those injectors need. I'm at about 90% DC in some pulls .

Is there a log I can do, or any other way to test if the pump is running out of steam?
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Old 01-11-2018, 11:13 PM   #2
2slofouru
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Maybe check pressure before and after the regulator, it could be bypassing too much fuel.













My comment was to lure an engineer or random smartass in to give a better answer.




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Old 01-11-2018, 11:21 PM   #3
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I thought of the regulator possibly letting too much through, but, it happens at high rpms.

What's the best way to measure this at 5k rpms/80mph?
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Old 01-12-2018, 02:49 AM   #4
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stock fuel lines everywhere, just the bigger pump and injectors?
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Old 01-12-2018, 12:05 PM   #5
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Correct
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Old 01-12-2018, 02:21 PM   #6
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We've already discussed this in another thread, PDX.

If you're logging two similar commanded fuel values and getting dramatically different AFRs, I would probably check rail pressure under load on a dyno with a gauge tee between the high pressure hose and rail barb, or just cut to the chase and replace the pump.

The regulator can go bad, but the pump is a much more common wear item.

I'm all for diagnosis first... but the last time I did this on a dyno, the gauge adapter I made that snapped into the OEM fuel breaks started leaking around the gauge's pipe threads so I chucked it in the trash. Replaced the pump, problem solved.

These are common symptoms of a failing pump.
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Old 01-12-2018, 04:59 PM   #7
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Hey Mr Saturn..... My VE table is dialed and I have the logs to show matching commanded and WBO2.

Also, this going lean thing doesn't happen every time. On the night in question I was playing with OL fueling and doing two runs per adjustment in real time. One would run out to redline at the commanded fuel/wbo2, the other would break loose at around 5k rpms.

I did this on three curves, and it happened on the dyno before fuel rails. I'll post pics of the afr graphs. It's freaky...

Then today I drove to Beaverton and back and it didn't happen once.

I agree though, seems like back to back pulls may be stressing the pump and dropping its efficiency.
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Old 01-13-2018, 03:23 AM   #8
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Have you considered wiggling some wire harnesses to see if you can recreate it during idle? The main engine harness connectors are good places to start - I had a single injector pin push halfway out of the OEM connector once and it did something like this.
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Old 01-13-2018, 09:00 AM   #9
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Get a AEM320, problems solved.
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Old 01-13-2018, 01:13 PM   #10
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Quote:
Originally Posted by GEE-OTTO View Post
Get a AEM320, problems solved.
Unless the problem is wiring + vibration.
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Old 01-13-2018, 04:47 PM   #11
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Is aem 320 a direct drop in? I was looking at the DW 300

I will be working on the car today and check the wires. It happened before the aos install which requires relocating the main harness under the hood.

And that was also before the rails where the installation requires the main harness be removed.

DW says this pump is far past its working range, (via chart on website-they won't answer phones) but what throws me is reading the 65 will full support 1050 injectors.
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Old 01-14-2018, 01:38 AM   #12
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Which turbo, how much boost, and E85 or regular gasoline? I didn't seem to recall that you were really pushing the limits on your motor at all...
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Old 01-14-2018, 01:44 AM   #13
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Tonight I took off the up/down and exhaust mani. pipes to get to the oil return line on the turbo and fix it the right way. I also wrapped my up / down with blankets. When I took off my header I found the passenger side center bolt was loose. So loose that this was happening - Oil from the leaky turbo drain line was literally being sucked up into the exhaust.

My question is - could this be why there is sporadic AFR problems? I don't notice a loss of spool, and it has been normal since dyno day when these were installed. But, I mean.... if oil can be sucked up it had to be a decent leak.

Also - how will this effect the VE of the motor? I just got done dialing the VE table in.




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Old 01-14-2018, 01:52 AM   #14
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Quote:
Originally Posted by mrsaturn7085 View Post
Which turbo, how much boost, and E85 or regular gasoline? I didn't seem to recall that you were really pushing the limits on your motor at all...
FP Green HTZ, 26 psi in 4th, 25.5 in 3rd. Hybrid boost control, 97 octane full time.

I think there's quite a bit left considering I'm running a 97 octane however with the going lean issue it's impossible to know.

Last night I bumped timing a a degree at a time and didn't see much gain, if any. Road dyno. However, timing is conservative from what I've read and been told. Peak is ~ 20 at redline

I'm really chasing my tail until I can get a consistent fuel reading.
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Old 01-14-2018, 01:10 PM   #15
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Leaking header gaskets will definitely cause issues, I'd run oem. The DW300 does make a good bit more than the 265. I'd try messaging/emailing Deatschwerks through their site, I've messaged them a few times this month and it didn't take long to get a reply.
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Old 01-14-2018, 01:14 PM   #16
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Quote:
Originally Posted by 2slofouru View Post
Leaking header gaskets will definitely cause issues, I'd run oem. The DW300 does make a good bit more than the 265. I'd try messaging/emailing Deatschwerks through their site, I've messaged them a few times this month and it didn't take long to get a reply.
Thanks. I will try the message suggestion.

Those weren't bad gaskets, those are loose nuts...... However, I did clean all the carbon up and will be keeping an eye on them.
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Old 01-14-2018, 01:18 PM   #17
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The reason I mentioned oem, is I've tried a few different aftermarkets, including the super thick ones, and they seemed to start leaking in a short time.
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Old 01-14-2018, 08:34 PM   #18
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Is it possible that exhaust leak would cause inconsistent, lean up top, Afr? Last night after the car was back together I set the afr at 11.00 straight down and from load 3.50-4.00 (4 load columns).

Stumped, because that afr line is dead steady at 11.00 after several runs.
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Old 01-14-2018, 09:02 PM   #19
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I've read that it can, it can also cause later spool.
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Old 01-14-2018, 09:04 PM   #20
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Thx. I've read about slower spool, rough idle, and a couple other issues but nothing about lean afr.

That's quite the leak I had, to be able to sucks up oil like that.
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Old 01-14-2018, 11:32 PM   #21
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I ordered a DW 300 with hardwire kit. Why take a chance when running boost in the upper 20s?
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Old 01-29-2018, 04:50 PM   #22
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Got the DW 300 pump installed, and hardwired. Now I'm rich and my VE table is a mess, since all the AFR WBO2 and commanded were dialed in with a pump that was going lean.

Starting to get a little frustrated!
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