3500 Fiero shopping list

[Joseph Upson]

using a FPR like that i would think would more work like the 3400 rails, just with a return line before rather then after, my post was more aimed twards using the people using doing swaps who use the vette non-vacuum straight-non variable 68psi regulators. altho if they are failing from stock too, i can see why the buildup is there.

If you leave the vacuum port disconnected it would deliver a non variable pressure.

[hookdonspeed]

does that regulator raise the pressure with boost?

[Joseph Upson]

does that regulator raise the pressure with boost?

Yes if you connect the vacuum port. 1:1

[IsaacHayes]

Seems like more work on a 3500 than to just use a 3100/3400 rail and be done.

Joseph didn't have that option with the 3900, he couldn't just swap to a 3400 rail... But with an LX9 you can...

[ForcedFirebird]

I'm familiar with the build up you are talking about but are you sure that isn't a side effect of newer fuel additives or ethanol. I recalled a rather shiny glazed looking appearance that I thought was unusual and noted that the engine I had disassembled was a Flex Fuel motor. I'm suggesting this because anything that would favor more pollution would seem unlikely, also the fuel rail is tall and square suggesting a design function to avoid abnormal fuel distribution.

Another issue I've noticed on some brand new cars is oil consumption particularly those running thin 0w15 and 5w15, my friends car with 25k on it was nearly 2 quarts low by the time the oil change was necessary and a different new car with the same engine running the same weight oil experienced the same. It is a common occurence so much so that we actually found a reference to oil consumption in the owners manual suggesting that may be what you are seeing coating the combustion chamber due to very thin oil getting past the rings, the trade off for better fuel economy.

Looks like rich deposits if I ever did see them, but you could be right since the fuel down here is >10% ethanol and I haven't seen any flexfuel at all.

Oil could be a possibility, but other engines I have taken apart recently didn't have near the deposits the 3500's have (most older engines).

[flimbob]

What years of fuel rails can be used? I see alot of 99 and below on Evil Bay.

[DefEddie]

Ethanol doesn't leave deposits,just the opposite it cleans them off.
Ethanol burning motor should be pretty clean when dissassembled in general.