AEM E85 Fuel Pump - Tube keeps falling off...

phunk · 06-23-2021, 01:24 PM

Drilling the regulator and venturi jet is a separate issue IMHO. While not drilling them will cause a fuel pressure spike at idle; 20-25psi in a line that small is relatively low pressure and should not be pushing the hose off a barb. That type of pressure deviation is a big deal in the way that it effects tuning, but it should be insignificant to the physical construction of the parts. If that is all it takes, I would still be looking for a different pump.

Jhill · 06-26-2021, 03:24 PM

So I went from the walbro 255 to these AEM pumps with the radium fuel hanger kit and so far no issues for me. Been about a month now. I was nervous of the lack of a barb but couldn’t stand the noise of the walbro and even after drilling the jet out in steps the fuel psi was still a bit high at idle and seemed to have some surging offidle. Now I’ve been very happy with these pumps and kit. Very quiet and I am able to set my fuel psi regardless of pump chosen with the adjustable regulator. Cars been driving good and just got back to town and will start doing e85 logs. I have heard the hose blow off in other places too like on donut media so I do think it’s stupid for AEM not to have one but so far I’ve been good, if it does fail Blow off I’ll be going with DW.

DrBacon · 06-26-2021, 10:13 PM

Quote:

Originally Posted by Jhill

So I went from the walbro 255 to these AEM pumps with the radium fuel hanger kit and so far no issues for me. Been about a month now. I was nervous of the lack of a barb but couldn’t stand the noise of the walbro and even after drilling the jet out in steps the fuel psi was still a bit high at idle and seemed to have some surging offidle. Now I’ve been very happy with these pumps and kit. Very quiet and I am able to set my fuel psi regardless of pump chosen with the adjustable regulator. Cars been driving good and just got back to town and will start doing e85 logs. I have heard the hose blow off in other places too like on donut media so I do think it’s stupid for AEM not to have one but so far I’ve been good, if it does fail Blow off I’ll be going with DW.

Curious if you've actually heard a walbro and it's too loud or just going off of what others say? I have a 525 and there was a barely audible hum with all of the interior pieces off and the top hat exposed, with all the interior back in I literally can't hear the pump at all. All my fuel "noise" comes from the fuel pressure regulator in the engine bay.

Jhill · 06-26-2021, 11:51 PM

Quote:

Originally Posted by DrBacon

Curious if you've actually heard a walbro and it's too loud or just going off of what others say? I have a 525 and there was a barely audible hum with all of the interior pieces off and the top hat exposed, with all the interior back in I literally can't hear the pump at all. All my fuel "noise" comes from the fuel pressure regulator in the engine bay.

Yes as I said I came from the walbro 255 and it was stupid loud (in my opinion). The walbro 255 is notoriously loud and is actually louder than their higher volume pumps. Google search it and you’ll find videos of it louder than an American muscle v8 exhaust and then switched to the DW and being whisper quiet. The walbro 255 is a vane pump most others (I believe including walbro higher volume) are turbine pumps.

DrBacon · 06-27-2021, 01:09 AM

Quote:

Originally Posted by Jhill

Yes as I said I came from the walbro 255 and it was stupid loud (in my opinion). The walbro 255 is notoriously loud and is actually louder than their higher volume pumps. Google search it and you’ll find videos of it louder than an American muscle v8 exhaust and then switched to the DW and being whisper quiet. The walbro 255 is a vane pump most others (I believe including walbro higher volume) are turbine pumps.

I overlooked the part of you having the walbro 255, my bad. I was just pleasantly surprised with the 525 as I had expected it to be fairly loud.

SeeThruHead · 06-27-2021, 11:39 AM

Quote:

Originally Posted by DrBacon

I overlooked the part of you having the walbro 255, my bad. I was just pleasantly surprised with the 525 as I had expected it to be fairly loud.

Blog Post Radium's Ultimate Fuel Pump Test

Quote:

The Walbro "255" uses a gerotor which is inherently noisy.

Spooler · 06-28-2021, 10:55 AM

Quote:

Originally Posted by DrBacon

I overlooked the part of you having the walbro 255, my bad. I was just pleasantly surprised with the 525 as I had expected it to be fairly loud.

My twin 450's are not even noticeable. You can barely here my one pump running at startup.

SG4247 · 06-27-2021, 05:31 PM

My DW is very quiet, and low amp draw, so these are reasons I wanted one.

It wont support big power, but it will make 400hp NA on E85.

lexi.z34 · 11-30-2023, 03:59 PM

Hey, I recently installed a 340lph aem fuel pump as well. I had issues for a while with the fuel line coming off and now I’m having issues as well with the wiring. What did you use to connect the wires? And what did you use for the line?

06-23-2021, 01:24 PM	#1 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,669 Drives: 370 Rep Power: 974724	Drilling the regulator and venturi jet is a separate issue IMHO. While not drilling them will cause a fuel pressure spike at idle; 20-25psi in a line that small is relatively low pressure and should not be pushing the hose off a barb. That type of pressure deviation is a big deal in the way that it effects tuning, but it should be insignificant to the physical construction of the parts. If that is all it takes, I would still be looking for a different pump. Rusty, Optimiser and Spooler like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

06-26-2021, 03:24 PM	#2 (permalink)
Jhill Track Member Join Date: Mar 2016 Location: San jose Posts: 854 Drives: 2013 370z sport Rep Power: 3385	So I went from the walbro 255 to these AEM pumps with the radium fuel hanger kit and so far no issues for me. Been about a month now. I was nervous of the lack of a barb but couldn’t stand the noise of the walbro and even after drilling the jet out in steps the fuel psi was still a bit high at idle and seemed to have some surging offidle. Now I’ve been very happy with these pumps and kit. Very quiet and I am able to set my fuel psi regardless of pump chosen with the adjustable regulator. Cars been driving good and just got back to town and will start doing e85 logs. I have heard the hose blow off in other places too like on donut media so I do think it’s stupid for AEM not to have one but so far I’ve been good, if it does fail Blow off I’ll be going with DW. Optimiser and BossJ like this.

06-27-2021, 05:31 PM	#8 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 813 Drives: 2010 touring Rep Power: 7842	My DW is very quiet, and low amp draw, so these are reasons I wanted one. It wont support big power, but it will make 400hp NA on E85. __________________ NA on E85 - 12.402 @ 112 mph 100 shot E85 - 11.589 @ 117 mph JWT C2 cams rev Base Circle & Titan Valves

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11-30-2023, 03:59 PM	#9 (permalink)
lexi.z34 Base Member Join Date: Jan 2022 Location: Florida Posts: 1 Drives: 16 Nissan 370z Rep Power: 4	Hey, I recently installed a 340lph aem fuel pump as well. I had issues for a while with the fuel line coming off and now I’m having issues as well with the wiring. What did you use to connect the wires? And what did you use for the line?