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

So title says it all...

Just put in a AEM E85 fuel pump in my 2016 370z Nismo - and the tube has fallen off the pump twice already, leaving me stranded - and towed right back to performance shop.

Just talked to Seb at SpecialtyZ and he's had similar issues, is there any FIXABLE solution to this pump?

We've tried 2 clamps and now 2 clamps and a heat shrink e85 tube (praying this one works) ...

Anyone else had this issue? Does AEM even know that this is an issue with their new revision?

This tube?

I ve had good luck with this tube and clamp set up.

Yeah is that a heat shrink e85?

What size hose are you using?

This is an E85 compatible tube with special clamps. You have to use side cutter pliers to deform or crimp the clamp around the nipple. It is hell for tight when done right.

This tube and clamp came with the Deutch Works pump kit I bought, see the image below.

The stuff in the DW200 370Z kit all fit my 370 perfectly.

The AEM pump kit i purchased originally, did not really fit my fuel pump module. The wiring for the pump is huge, and the car harness will run hot because the AEM pump pulls more amperage. The hoses are not real great either. So, I sent the AEM kit back and run the smaller DW pump with great results. Charles (CJM) really helped me with my fuel pump upgrade.

Thank you. I’ll look into this if I get stranded again.

So a tuner of mine said, if I just turn the car on snd let it run for awhile - that would be a good test for the tube staying on,

Is this a good idea?

Because frankly, I just don’t trust my car right now and if I get my pregnant wife stuck one more time, she may kill me :) - JK she loves the car but hates what it’s been doing.

I mean if the hose blows off the fuel pump the car will die even if parked.

So, that might be a good initial test.

Thanks. Been running it for about 4 hours today, off and on... hasn't blown off yet...

Last 2 times it blew off was about the 4 hour mark - once at stopped at a light, idling and the other time driving down the road.

Does the pump not have a hose barb on it? Once the clamp is tightened, the inside diameter of the hose should be mechanically reduced enough that it could not fit over the hose barb and come off.

Nope - the new version of the AEM e85 pump has no barb on it... -_-

Seb has had issues with it as well, he's had to double clamp...

oh geez, what a dud. I wouldnt use it at all. Maybe in a 350z since that pump housing doesnt need a barb the way it supports the pump from the bottom and holds it up into a rubber grommet. But the 370z has to have a hose connected, and with no barb, that is useless IMHO.

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?

On another note.
How big is the pump?
Do you have a FP gague?
Did you drill the pump assembly?
Are you still returnless or is it a return style?

Usually E85 pumps are an upgrade and are higher flow, this is why the assembly needs to be drilled to relief some of this extra pressure it creates since the factory fuel pressure regulator located in the pump cannot control pressure since the added flow turns into added pressure since the injector duty cycle is low at idle. This is where a pressure gauge comes in handy, if this is the case you should see an increase in pressure at idle - the fix for this is to drill the relief a bit more.

A heavier duty hose and clamp will stop the tube in place but if you've not done what I posted in the top you'll have fueling issues in the future.
This is the downfall of the returnless system - any increase of flow will turn into pressure if not regulated.

Good luck!

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.