fuel presure regulater

[ukdave]

my fuel pump or my fpr is going out. im not sure what is a good afpr? im gonna get the walbro 255lph and im gonna get a afpr but i just wanna know what is a good one thats not gonna brake the bank.

 

[95blackGsTurbo]

People say to get one because the stock one is old and weak. If you get a new one it will hold.If you get an Aeromotive it will hold. The Aeromotive is just prettier and more expensive. People are very quick to just say get an aftermarket but to my knowledge, I'm the only one to do testing on the stock OEM regulators and my results are proof enough for me regardless of what others think. I am not saying a 19 year old stock one will hold or even a 10 year old stock one will hold. But replacing it with a new one will. Since you have a rail mounted gauge, take a chance and get a new OEM one. If it will hold dual 255lph pumps for E85, I'm sure it will hold whatever you are running.

 

[ramsack]

nope, going with an AFPR and doing away with my gauge-on-rail. as i said before a 2g rail is needed to fit a 2g regulator (for 43.5 psi) and i don't feel like having a 2g rail if i get different injectors and maybe have to grind some material away to fit the connectors.

 

[ukdave]

if i can get a stock fpr i will test it out. and i will be running a walbro 255lph, 1000cc injectors

 

[jrohner]

nope, going with an AFPR and doing away with my gauge-on-rail. as i said before a 2g rail is needed to fit a 2g regulator (for 43.5 psi) and i don't feel like having a 2g rail if i get different injectors and maybe have to grind some material away to fit the connectors.

I've used a 1G regulator on my 2G in the past, so I don't see why it wouldn't work the other way around. I just spent < 5 minutes and redrilled the holes.

I've always used stock regulators with the 255hp pumps (2 1G's, and 2 2G's), and haven't seen an issue yet, either logging or just driving; not much gasoline usage though since 91 sucks and we have awesome E85 around here.

what do i do if the fuel pressure solenoid is bad, the part stores cant get one. is it safe to just bypass the fuel pressure solenoid

Get rid of it, it's pointless to have.

 

[slowasdsm]

I have a upraded one. Mines not even mounted and looks and works perfectly

 

[ramsack]

i rewired my 255hp and guess what? fuel pressure doesn't go down with vacuum anymore. i fail to see how this is a faulty or old fpr causing this. if the internals get weaker over time, they would hold less pressure, not raise it. diaphragms for AFPRs are only like $25. where are you getting these "facts" that they only last for x amount of years and that stock regulators last y amount? as far as i can tell the stock regulators DO overrun and they get "ruined" quicker than an AFPR which is made to handle heavy duty use. those of you who supposedly have a 255hp and don't overrun should check that its actually the 255 High-pressure pump, and not just the normal 255. i also don't believe that dual 255 of any form or bosch 044 don't overrun.

 

[95blackGsTurbo]

Then I guess all the cars I seen with those setups must just be running 255hp pumps with different internals. You obviously aren't getting what those of us who are sucessfully doing it and have put time into it are saying. And from 9 years of DSM work, your average Aeromotive AFPR will last 3-4 years tops.

 

[95blackGsTurbo]

You can have lack of fuel pressure or excessive fuel pressure if a regulator is going bad. Just depends on the internal design. Take apart your regulator and look inside of it and it will make more sense.

 

[ramsack]

i know how a regulator works i have taken my bad one apart that was hitting 60 bsi base. how does that much gas flow through a 1/16" hole and only have about 40 psi is what i would like explained.

52 gallons of gasoline per hour can flow through a 1/16" orifice @ 40 psi. that's not even taking into the account the restriction the return line adds or the diaphragm and spring. the 255HP @ 13.5 volts @ 40 psi flows 70 gallons per hour. granted that is a perfect world where the FPR would be right on the fuel pump and not have to worry about a fuel line.

so how does this make sense? what about bigger pumps? what about double pumps?

maybe the fprs were redesigned later on? this is what i'm thinking. still, who is gonna get bummed out having to buy a $25 part supposedly 3-4 years later vs. a $60 part supposedly 10 years later? you only pay for the full AFPR once.

 

[TenSecondSTi]

So much nagging going on . Lol It's a stupid fuel pressure regulator they all work just fine. The adjustable one is just there for those who can't hit target base fuel pressures. And to look pretty. Or so you can bump the fuel pressure up for injectors that need more base pressure. like some ID2000's witch I run in my Subaru.

So if you run stock injectors or something close to them don't waste your money buy a new stock one. I don't dought the OEM one is more reliable and will last longer. But I know the fuel lab ones are great also. It just comes down to do you really need that. And most don't..

 

[ramsack]

injectors have nothing to do with controlling fuel pressure. it's the pump. i have been through several stock ones and they all have overrun, so i will get an AFPR. it is not a shiny waste of money. it can be a valuable tool for people with something like an afc so they don't have to remove as much MAS signal adding timing advance to the mix.

i run stock injectors and i can't hit base fuel pressure. my fuel pump was bad and my walbrok 255hp was free. which would you take? a free upgraded pump and knowing you need an AFPR or a stock pump for money and keeping your stock regulator? the choice for me was obvious.

 

[TenSecondSTi]

injectors have nothing to do with controlling fuel pressure. it's the pump. i have been through several stock ones and they all have overrun, so i will get an AFPR. it is not a shiny waste of money. it can be a valuable tool for people with something like an afc so they don't have to remove as much MAS signal adding timing advance to the mix.

i run stock injectors and i can't hit base fuel pressure. my fuel pump was bad and my walbrok 255hp was free. which would you take? a free upgraded pump and knowing you need an AFPR or a stock pump for money and keeping your stock regulator? the choice for me was obvious.

I didn't mean it like that.


But fuel pressure has a lot to do with injectors being controlled to idle.


The only way someone should need a AFPR is if they can't tune big injectors to idle right. In witch you would lower fuel pressure.


One shouldn't try to bump fuel pressure to run more boost. It's a half ars way of doing thing's.

I've used AFPR and they work great I'm not dissing them in anyway. But some people really don't need them for there set up