gingles

iTrader: (1)

So i installed my aeromotive FRP not to long ago and it takes forever to crank....id say about 3-6 seconds.....i heard our fuel pumps arent self priming.....anyone have this problem?

gingles

iTrader: (1)

bump

Complication

Check the Fuel Pressure itself, it should be around 50-60.
The Scion fuel pump will prime when you turn the car off so technically it is self priming. Its not like a Nissan, they prime when you try to turn the car on. Ours is just the opposite.


hope that makes sense.

gingles

iTrader: (1)

i was told to have pressure around 47.....i guess ill bump it up to 55.....i mean is it normal for it to take so long to crank now?

Complication

Im not sure about taking it too long to start. It could be any number of factors that is causing it. It you break it down.

Things to check.
1) make sure it is getting proper spark: (ie check coil packs, plugs and other related components)

2) Make sure it is getting the proper amount of fuel (ie setting the regulator properly, be sure to have the proper sized fuel pump installed, check your injectors make sure they are all firing properly)

3) Finally check your starter. Make sure it is getting the proper amount of voltage, and make sure it is connected, tightened down and adjusted properly as well.

But before you get to deep into things, I'd make sure your FPR is set up correctly. that should help.

BlackKnight

What mods do you have specifically engine management and fuel system? Have you changed your fuel pump? If so check to make sure it is not bleeding down. Did you bypass the oem fpr?

gingles

iTrader: (1)

this problem only started when the FPR was installed........i installed it a different way then most people......left side is from tank....right side is feed, and bottom is return...................but my setup is walbro pump to aero fpr to descendent rail holding rc 750's

ElevationTC

uh.. i dont think thats even right?

A fpr is suppose to be after the fpr thats the whole point is to keep the extra pressure in the fuel rail :slap

gingles

iTrader: (1)

ive seen hundreds of other cars do it this way....its supposed to keep the fuel cooler

ElevationTC

your still running into the issue the last injector will get less fuel then the first one..

ur woried about hot gas. get water meth

gingles

iTrader: (1)

ight ill do it the other way.......tank to rail, rail to FPR, FPR to return then

BlackKnight

You have it done right. He is using a bypass regulator like me. I have an Aeromotive one as well. The setup is the same as stock with a return added so are you saying Toyota had it wrong from the factory? I doubt that.

Things to check that I had issues with: All fittings tight and not a very slow leak, fuel pressure should be 43-50 unless there is a need to change the pressure, most importantly check the fuel pump in the tank is secure and not bleeding down. The seal on top, my fuel pump starting slipping out of the assembly a little so I used safety wire to secure the pump in the modified housing (this was my issue). You need to solder the fpr in the tank shut to make sure both regulators aren't working against one another. If none of this fixes the issue then recheck your fuel pressure at the rail if its ok then it is your tune.

gingles

iTrader: (1)

well see black i took the stock FPR out completely and everytime i fill up i check for leaks and so far so good.

ElevationTC

i run the aeromotive as well.. Tank first pump - second pump - fuel rail - aermotive fpr - line back to tank..

Flawless operation for me

10sec05

x2

BlackKnight

If possible send pics of your fuel pump setup, if you have the stock regulator out and the hole isn't plugged that could be your issue.