If that is the case then aeromotive has changed in quality. The one I recently opened was a few years old. The one I opened was not holding fuel pressure. Opened it up to find aluminum shaving on seat. put it back together and it works like a champ. The hole for seat did not look like it was drilled in china if you know what I mean.

 

you got my curiosity peaked. just had to go remove the 4 screws. will take pictures tomorrow. I will let pictures do the talking. in short my memory serves.

 

here they are.

 

^ Looks like you have a different model than Ted and I have. Ours is the "Compact" version which only has one return port. Maybe Aeromotive cheaped out when they made these. Ted and I got ours over a year apart so I doubt it was a bad batch. This model may be made elsewhere....

 

I am just putting this out there, do what you guys want with it. There is absolutely NO need to have an adjustable regulator on 99% of the EVO's. It's a mess if you ask me, uncalled for expense, crappy AN hoses etc. There just isn't a need for it.

Bolt the stock regulator back on, it works great and fits like it is suppose to.

 

Agreed, an aftermarket rail and regulator do not deliver a peformance improvement. In my case, I wanted teflon lines and a FP gauge, which turned out to be useful in my particular, somewhat unusual situation, which involves E85. Otherwise, I'd have just left it all as-is.

 

Where so you draw the line on if you need or not?

 

Unless there is something happening that necessitates a new fuel system, or one is running two pumps in parallel simultaneously, this is a non-issue for the vast majority of street/strip applications.

 

A standard single fuel pump rewire that eliminates low voltage mode will also necessitate an aftermarket fpr.

 

To go along with mrfred, it's normally the added voltage that overruns the stock FPR rather than the fuel itself.

 

If that happens, the easy modification I described here will fix the issue (at no cost):

https://www.evolutionm.net/forums/ev...ould-know.html

I have verified that it does not inhibit the Bernoulli effect that siphons fuel from the auxiliary section of the tank to the main section.

FYI

 

So for a single pump at full voltage at idle, you think its the siphon that causes overrun and not the fpr?

EDIT: BTW, nice to see that you're still around.

 

The factory siphon has proven to be the bottleneck in aftermarket setups (like mine) that must return greater fuel volumes at low load situations as a result of increased pump capacity. Regardless of upgrades made to the FPR and return system, the siphon remains the weak link in that part of the system. That much we know.

What we don't know is if the factory FPR and/or return line are collectively less capable than the siphon, but my hunch says 'no'. Fortunately, all it takes is a 9/64" (3.5mm) drill bit, a few hand tools, and about 20 minutes to verify.

As for my disappearance, I needed to devote my mental energies elsewhere for the time being. Otherwise, I've not (yet) met an untimely demise...

 

Thought you had been locked up for disturbing the peace while indulging in an absinthe binge.