[Yellow68SS]

I have a problem with my fuel pressure changing pretty fast back and forth. When set for approx 8psi it rapidly goes between 7 and 9. When i first turn on the pump it stays solid for about 5 seconds and then goes to moving. It is a return style system.

I use an Aermotive A1000 pump, connected with a relay. -8pressure and return lines.

When i Talked to Aeromotive the guy couldn't think of anything but voltage drop?? its hooked up the same as it always has been.

What do you thinks think?

 

[zeke67]

Not sure, but assuming the pump is operating steadily then possibly your regulator is cycling too slowly to maintain the pressure. Maybe it's over size or not functioning right? I always thought the return line should be one size smaller than the supply line, but not sure if this would have anything to do with it -- maybe add some resistance on the return side and see if it settles down.

 

[HPseeker]

You need a liquid filled gauge ,it will help with the vibrations that damage the guage and will help keep the readings from going back and forth .

 

[Yellow68SS]

You need a liquid filled gauge ,it will help with the vibrations that damage the guage and will help keep the readings from going back and forth .

I have run a liquid filled gauge before, and my buddy currently has one on his car. They may read steady from the resistance to vibration but the pressure reading itself is greatly affected by temp. Aeromotive claims that the liquid gauges can read up to 7lbs different from the changing temp.


I was wondering about the pump not being able to keep up with the regulator but both times i have talked to Aeromitve they just say its overkill, but should work fine.

 

[EkS]

Wow, I never heard of a liquid filled gauge reading differently because of temps. Anyone know the temps under the hood? I would want to try and experiment with this. I have all the utilities I need in our lab. Just need to know the temperatures to test at.

 

[Yellow68SS]

That would be very interesting to me as well! Just try starting at like 75 and going up to like 150. My friend that is still running the liquid filled gauge was consistantly losing pressure. from 6 down to 3 and sometimes 1!!. So last night i told him to try and get the gauge cold after the test runs and the pressure went back to 6!

When i had a liquid filled gauge i was always turning the pressure up just to get 4 psi. Then i got a non liquid filled and key on 12 psi! Have no idea how i didn't blow past the needle and seats:clonk:

I would really like to find out the results.

 

[EkS]

I can try that. I have a liquid filled gauge at home that I was going to use on my BB, I will use that for the test. I know the gauge is dead on, I've checked it . Little perks about where I work.

Too bad I can't do the test till next week. I didn't know I was going to need my pressure gauge so I didn't bring it. :clonk: