Well since my Walbro that was fine for 30k miles died after 5k miles of E85, and this AEM that replaced it lasted less than 1000 miles, I think it may not be the pump's fault. I don't know what is though.

Replaced AEM 320lph with DW300, still hard wired of course. Worth noting that it also does not make "priming sound." It runs, but not well at high load/low rpm above ~12psi. Acts like misfire, runs lean. Think I need re-tune. this is bugging the hell out of me but I haven' had time to set up my new computer to log.

What causes:
Low RPM, high gear lean AFR, "misfire" symptoms but otherwise runs well off boost? Plugs have been replaced with new NKG copper heat range 7 just to check, gapped down incrementally from .024 to .019. These replaced~8k iridiums gapped to .019 by tuner and ran fine until recently, looked fine. Problems persist.

Stumped.

seems like the grommet that seals the pump nozzle to the pump carrier might be leaking badly.

also, what fuel, what injectors, and what injector scaling?

Mrfred, I feel lucky to have you subscribed and replying, thank you. This is all on E85, FIC1100 high impedance, I don't know injector scaling, was tuned by Sean @ FFTEC. You think the leaking pump to carrier could be the culprit? I should probably check the FP and put the stock pickup sock back on since it just came in.

if the tune is good and the pump is working, then its either the grommet, is not sealing, the fuel filter in the pump carrier is clogged, the fuel sock is clogged, or the fpr has failed. i've nefer heard of the latter most item. my guess is one of the first three.

What other pumps are stock replacements? also thanks for sharing the info on the 4runner fp sock.

There are SO many now compared to 3-4 years ago. Just looks through MAP's selection.
I am now running a Deatchworks DW301. I also installed a Spoolinup COP and gapped BR7EIX to .022. I'm finally settling in to my new garage so when I get a minute I hope to solve a nasty boost leak that is causing problems. In the meantime, my Tacoma's tranny blew. Tough couple months!

Has anybody been hammering this fuel pressure release port spring down like on the wally 255's so it can't pop off? Or does this not work the same on this pump?

I installed the AEM pump on my car today because I plan on doing some mods in the near future. I have owned the car for six years, so it came as a surprise to me that I already had a walbro gss342. After a few minutes of pondering whether to sell the AEM and walbro install kit, I continued with the install.

I had an issue with the pump not priming afterwards. After many attempts to start, I tried simply putting fuel into a container with the pump. After a few attempts, there was no fuel coming out.

I pulled the housing apart again to check everything. I found that there is a small hole on the bottom of the pump that is not on the walbro. I had used the rubber insulator that came with the walbro install kit on my AEM pump. The walbro insulator is very thick and completely blocked this hole. The AEM insulator has a hole cut into it that matches to the hole on the pump. Unfortunately it did not fit under the plastic cap.

At this point I thought I might have to drill through the rubber to get this to work. I took a look at the stock insulator that was on the car. It had some additional spacing around the edges which looked like it should do the job. I dropped the assembly in the tank and cranked it and a little gas came out. After connecting everything, the car started within 5 seconds on the first crank.

The walbro version on the left, the AEM on the right.

So... is the pump working good? Updates? AFR's?

One update is AEM just released their E85 compatible fuel pump. Part #50-1200. Same dimensions and flow as their other pump. A little bit more expensive, but not by much and they say it is compatible with 100% Ethanol, 100% Methanol and Gasoline Blends. The internals are designed specifically Alcohol blends where the other one was not.

I thought that the original was advertised as E85-compatible.

It is compatible, but will diminish the life of the pump since it was not designed for the non lubricating properties of E85. Most people will say they are compatible, but diminish life of the pump. The new one was designed specifically for 100% alcohol.

So nobody has tested the new "E85-proof" version? I guess compatible means 'it'll work, but will die quicker'? LOL

I'm tempted to test this and see if their claims hold up. If it supports 500-550 whp dynojet on E85, I'd much rather drop it in than do all the work for a Walbro 416.

It won't get you there. It can do maybe 500 whp at best when providing the intended fuel rail pressure. Now just like people have done for the Walbro 255, it can be run past its limit, and you could make up for the loss of target fuel pressure by running large injectors and bit IDCs. Then maybe it could do 525 whp or some such thing, but its not the way to do it.