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Old 08-28-2013   #1
mark4g63t
 
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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!
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Old 08-28-2013   #2
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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.
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Old 08-28-2013   #3
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Re: Fuel Pressure Fluctuates
ok. I'll try that now. Thats a good idea.
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Old 08-28-2013   #4
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Re: Fuel Pressure Fluctuates
really its not the diaphram?
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Old 08-28-2013   #5
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Re: Fuel Pressure Fluctuates
fuel pump is not pulsing
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Old 08-28-2013   #6
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Re: Fuel Pressure Fluctuates
Diaphragm?
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Old 08-28-2013   #7
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Re: Fuel Pressure Fluctuates
I can take pics but it looks perfect
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Old 08-28-2013   #8
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Re: Fuel Pressure Fluctuates
Diaphragm
Attached Thumbnails
Click image for larger version Name: 2013-08-28_13.18.34.jpg Views: 311 Size: 35.2 KB ID: 13943   Click image for larger version Name: 2013-08-28_13.18.14.jpg Views: 319 Size: 35.3 KB ID: 13944   Click image for larger version Name: 2013-08-28_13.17.53.jpg Views: 321 Size: 35.2 KB ID: 13945  

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Old 08-28-2013   #9
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Re: Fuel Pressure Fluctuates
was not wet either on top of it when I took it apart
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Old 08-28-2013   #10
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Re: Fuel Pressure Fluctuates
I can blow through my return line no problem and it bubbles the tank. so it's not that
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Old 08-28-2013   #11
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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
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Old 08-28-2013   #12
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Re: Fuel Pressure Fluctuates
doesn't pulse or fluctuate
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Old 08-28-2013   #13
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Re: Fuel Pressure Fluctuates
Try to use an actual mechanical fuel pressure gauge. The one you are using might not be accurate.
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Old 08-28-2013   #14
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Re: Fuel Pressure Fluctuates
it works fine otherwise
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Old 08-28-2013   #15
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Re: Fuel Pressure Fluctuates
going to hook it back up and try it again...
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Old 08-28-2013   #16
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Re: Fuel Pressure Fluctuates
WORK FINE NOW!! WTF?!?
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Old 08-28-2013   #17
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Re: Fuel Pressure Fluctuates
User error FTW!
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Old 08-29-2013   #18
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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.
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Last edited by mark4g63t; 08-29-2013 at 10:38 AM..
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Old 08-29-2013   #19
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Re: Fuel Pressure Fluctuates
lol thats what I'm thinking. who cares if it works
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Old 08-29-2013   #20
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Re: Fuel Pressure Fluctuates
Quote:
Originally Posted by mark4g63t View Post
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.
Your wastegate has no effect to your engine vacuum.
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