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

phunk · 06-22-2021, 02:37 PM

Quote:

Originally Posted by BossJ

Yeah if it does it again, I'm gonna trash it, and talk to AEM about why they changed it.

But is there anything else out there? The DW pump?

Yes there are several other pump options from DW, Walbro, Aeromotive, and AEM probably even has other pumps with a hose barb.

Optimiser · 06-23-2021, 12:44 AM

Quote:

Originally Posted by BossJ

So bare with me, I'm not a vet on here or smart when it comes to cars, like most of you on here.

I take my care to a performance shop in town, who's been amazing, up till this issue (and it may not be their fault necessarily).

They recommended (as well did Seb) the aem50-1200 fuel pump.

How big is the pump? aem50-1200
Do you have a FP gague? No - but this may be my next purchase
Did you drill the pump assembly? No idea - I don't think it needed it? (Again, I'm not a car guy to this extent)
Are you still returnless or is it a return style? I'm guessing it's the same as stock. Nothing changed but the pump.

Just know, I'm not the smartest with cars, but I do not make any changes to the engine without first talking to Seb about it.

Thanks for your help and questions guys.

This is AEM 340L E85 Pump (AEM 50-1200) I'm using now with (no barb) just hose clamp with no issues after over a year. My regulator has been previously drilled wider though as per the Stillen SC instructions for a larger than stock fuel pump.

BossJ · 06-23-2021, 08:12 AM

Quote:

Originally Posted by Optimiser

This is AEM 340L E85 Pump (AEM 50-1200) I'm using now with (no barb) just hose clamp with no issues after over a year. My regulator has been previously drilled wider though.

So maybe the regulator not being drilled wider is the issue?

Optimiser · 06-23-2021, 08:23 AM

Quote:

Originally Posted by BossJ

So maybe the regulator not being drilled wider is the issue?

I believe it should be for a larger than stock fuel pump.

Sent from my iPhone using Tapatalk

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.

phunk · 06-23-2021, 01:27 PM

Quote:

Originally Posted by Optimiser

This is AEM 340L E85 Pump (AEM 50-1200) I'm using now with (no barb) just hose clamp with no issues after over a year. My regulator has been previously drilled wider though.

The pump kit in that photo seems ridiculous to me. I can see for maybe a low pressure scavenge system it would be fine.. but still, why even produce a fuel pump case without barbs? Seems like a proprietary fitment that should only be used with a bushing in a case, and inappropriate for use with a hose and clamp.

BossJ · 06-23-2021, 06:22 PM

Quote:

Originally Posted by phunk

The pump kit in that photo seems ridiculous to me. I can see for maybe a low pressure scavenge system it would be fine.. but still, why even produce a fuel pump case without barbs? Seems like a proprietary fitment that should only be used with a bushing in a case, and inappropriate for use with a hose and clamp.

So - so far the only way I've 'fixed' this and hopefully it stays fixed is with a - heat shrink e85 tube... and double clamp... I know a few others have used this pump and it's fine, but that's my only solution.

My question is, I need to get the regulator and venturi jet drilled now? Seb didn't mention anything about this...

Here's a maybe separate issue? I'm randomly getting RPM drops after driving for a bit and stopping. I'm cleaning my MAFs and throttle bodies tomorrow - so far that seems to be the more likely culprit, could it be the new fuel pump?

Seb said I didn't need a new tune and he looked at my tune after fuel pump installation and said it was fine - other than the rpm drop (he's looking into it).

Thanks guys

Optimiser · 06-24-2021, 01:15 AM

Quote:

Originally Posted by phunk

The pump kit in that photo seems ridiculous to me. I can see for maybe a low pressure scavenge system it would be fine.. but still, why even produce a fuel pump case without barbs? Seems like a proprietary fitment that should only be used with a bushing in a case, and inappropriate for use with a hose and clamp.

Well I guess I've been lucky then.

phunk · 06-24-2021, 11:42 AM

Quote:

Originally Posted by BossJ

So - so far the only way I've 'fixed' this and hopefully it stays fixed is with a - heat shrink e85 tube... and double clamp... I know a few others have used this pump and it's fine, but that's my only solution.

My question is, I need to get the regulator and venturi jet drilled now? Seb didn't mention anything about this...

Here's a maybe separate issue? I'm randomly getting RPM drops after driving for a bit and stopping. I'm cleaning my MAFs and throttle bodies tomorrow - so far that seems to be the more likely culprit, could it be the new fuel pump?

Seb said I didn't need a new tune and he looked at my tune after fuel pump installation and said it was fine - other than the rpm drop (he's looking into it).

Thanks guys

The drilling was probably done at the same time the fuel pump was installed. Especially if you had it installed at SpecialtyZ, they would be well aware that you need to do that any time you upgrade the fuel pump in the Z. You may as well keep using the pump since you already have it and its holding together for now. But anyone reading this thread should be able to tell they should avoid it and get something else if they didnt already buy one.

BossJ · 06-24-2021, 02:40 PM

Quote:

Originally Posted by phunk

The drilling was probably done at the same time the fuel pump was installed. Especially if you had it installed at SpecialtyZ, they would be well aware that you need to do that any time you upgrade the fuel pump in the Z. You may as well keep using the pump since you already have it and its holding together for now. But anyone reading this thread should be able to tell they should avoid it and get something else if they didnt already buy one.

So I should of been more clear.

I'm in FL - so I just chat to Seb on the phone every great while. My shop in town, did not drill anything.

I take it, that NEEDS to be done - What do I tell them exactly to do? I'm going to Ztuner in Bradenton tonight, to get it dyno'd and looked at...

I just got my MAFs and TBs cleaned out as well.

Thank you

phunk · 06-24-2021, 03:16 PM

Quote:

Originally Posted by BossJ

So I should of been more clear.

I'm in FL - so I just chat to Seb on the phone every great while. My shop in town, did not drill anything.

I take it, that NEEDS to be done - What do I tell them exactly to do? I'm going to Ztuner in Bradenton tonight, to get it dyno'd and looked at...

I just got my MAFs and TBs cleaned out as well.

Thank you

If the pump is flowing as advertised, it would need to be done. A fuel pressure gauge is the only way to confirm its necessary, or that drilling has been sufficiently performed.

https://cj-motorsports.com/p/tech

find the 370z fuel pump tech PDF. Have them read section 8 and 9 on repeat until it makes sense.

BossJ · 06-24-2021, 03:23 PM

Quote:

Originally Posted by phunk

If the pump is flowing as advertised, it would need to be done. A fuel pressure gauge is the only way to confirm its necessary, or that drilling has been sufficiently performed.

https://cj-motorsports.com/p/tech

find the 370z fuel pump tech PDF. Have them read section 8 and 9 on repeat until it makes sense.

Thank you.

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.

06-23-2021, 01:24 PM	#20 (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	#28 (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.

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