I have installed a Walbro255lph pump and have a fuel press problem that a adjustable reg isnt helping either! can a tune help this high presseure prob?

82-83psi on idle!!

Thanks!

 

nope the pcm does not monitor the fuel pressure. you need to get it back down.

 

Sounds like your adjustable regulator is no good. Try the stock one.

 

You can tune for some difference in fuel pressure, and I would say that you could tune to compensate for most of that difference, but that doesn't change the fact that you DEFINITELY have a problem there! Tuning around that is just going to make a potentially serious problem.

Even if you get it tuned so that it runs better, you risk the injectors going static on you at such high pressure...

 

what does static mean??? I assume that it means damaged injectors in some way.

 

you could lock them open or closed, and either way it's bad.

 

either way would not fix a thing. it wouldnt even compensate for anything

 

Raising the injector constant could compensate for the added flow of the increased fuel pressure. HOWEVER, as I said before, it does not fix the problem, it just attempts to work around it.

 

Thanks guys!

I found out that my REG was defective and my shop is getting me a new one free of charge.

 

Just curious... what brand was the AFPR? Any chance it was an Aeromotive.

 

Aren't the Aeromotives good for the diaphragm rupturing?

 

No its a Holley.

 

I see an awful lot of people posting problems with brand new Aeromotive units, and when I post that info, 5 people will post and tell me their Aeromotive AFPR works fine.... so I was just curious if this was yet another data point to indicate the Aeromotive stuff was not very good. But this one is a Holley.

 

I have had my Aeromotive AFPR for 4 years now and no problems so far. What do you guys like to use for base fuel pressure on an LT1? I just bought a new Sunpro fuel pressure gauge to verify mine, and it was like 48psi with the vacuum hose on, and 54 off. I brought it down to about 38 with vacuum, and 44 with it off. Havent test driven it yet, but it sure hasnt helped my split BLM problem at idle



Nick

 

I use the holley no probs here, my fuel pressure is about 43 at WOT helps to have an electric fuel pressure guage inside the car at all times

Matt.