Fuel Pressure Fluctuates
 

Having a fuel pressure problem where it goes crazy and bounces between 38 and close to 60 psi. Just pulled the AFPR it's an Aeromotive A1000 and it still looks new inside. Checked the return line and nothing blocked it as far as I could see.
Here's the video of what it's doing.
Thanks for all the help so far!

Re: Fuel Pressure Fluctuates
 

Another idea, maybe take off the feed line from the rail and put into a bucket, see if you are getting weird pulses of fuel instead of a constant flow. If you have the time, check another pump.

Re: Fuel Pressure Fluctuates
 

ok. I'll try that now. Thats a good idea.

Re: Fuel Pressure Fluctuates
 

really its not the diaphram?

Re: Fuel Pressure Fluctuates
 

fuel pump is not pulsing

Re: Fuel Pressure Fluctuates
 

Diaphragm?

Re: Fuel Pressure Fluctuates
 

I can take pics but it looks perfect

Re: Fuel Pressure Fluctuates
 

Diaphragm

Re: Fuel Pressure Fluctuates
 

was not wet either on top of it when I took it apart

Re: Fuel Pressure Fluctuates
 

I can blow through my return line no problem and it bubbles the tank. so it's not that

Re: Fuel Pressure Fluctuates
 

must be gauge or something but it does fluctuate the fuel pressure
going to hook the fpr up but not the return line and put that in the bucket to see what happens

Re: Fuel Pressure Fluctuates
 

doesn't pulse or fluctuate

Re: Fuel Pressure Fluctuates
 

Try to use an actual mechanical fuel pressure gauge. The one you are using might not be accurate.

Re: Fuel Pressure Fluctuates
 

it works fine otherwise

Re: Fuel Pressure Fluctuates
 

going to hook it back up and try it again...

Re: Fuel Pressure Fluctuates
 

WORK FINE NOW!! WTF?!?

Re: Fuel Pressure Fluctuates
 

User error FTW!

Re: Fuel Pressure Fluctuates
 

lol. More like cursed garage. Well started and idled fine. I ended up gaining a few in of vac. back when I put the wastegate on that was lost from my over ported flapper and or bigger size hose to gauge. One I had was tiny. Now has a coolant leak from the lower hose. must have a rip in it or something. Will replace it in the morning if oreillys has one or if I can steal the one from Blakes aluminum rad.

Re: Fuel Pressure Fluctuates
 

lol thats what I'm thinking. who cares if it works

Re: Fuel Pressure Fluctuates
 

Your wastegate has no effect to your engine vacuum.

Re: Fuel Pressure Fluctuates
 

You jacked my lower rad. hose? Dick :)

Re: Fuel Pressure Fluctuates
 

Almost forgot to mention I have a weird rusty color in my coolant. Could It be copper spray from my headgasket?

Re: Fuel Pressure Fluctuates
 

Not yet I haven't. lol

Re: Fuel Pressure Fluctuates
 

When was the last time the coolant was flushed? You should also do a block test. Easy way to tell if you have exhaust gas in the coolant.

Re: Fuel Pressure Fluctuates
 

I just ran straight hose water through it not to long ago. I'll post another pic of the pan I put the coolant into. There is settlement on the bottom.

Re: Fuel Pressure Fluctuates
 

I doubt a little copper spray would be visually noticable in the 3+ gallons of coolant in your system

Re: Fuel Pressure Fluctuates
 

The rust color may come from some breakdown inside of the radiator. I would just monitor the coolant color as you continue to drive it.

Re: Fuel Pressure Fluctuates
 

cool. I'll keep flushing it out.

Re: Fuel Pressure Fluctuates
 

It's always confidence inspiring when you take something apart that isn't working, find nothing wrong, then put it back together and it magically starts working fine.

Re: Fuel Pressure Fluctuates
 

^x2.

Re: Fuel Pressure Fluctuates
 

Yea makes you feel awesome for no reason lol. Well drove the car to Forest Lake a couple times. Going to keep flushing the coolant system out. Feels good at the moment.