fuel pressure drop off.

[compression]

Well, last week seemed to be running great. This week the fuel pressure rises to about 50 psi and drips back to base (43psi). I ran the pump with the car off for a little while moving the pressure up and down and it pushes and holds 80 psi like a champ. But that's with the car off.

Could this be a regulator issue? Maybe the pump is bad? It sounds like it cavitating but I lowered the pump to the ground and its still making these noises. Pump is Bosch 044

http://s48.photobucket.com/albums/f.../mxdawg121/?action=view&current=VIDEO0071.mp4

Also took the pump and fuel filter out and cleaned it, then I moved the fuel filter pre pump. It's 40 Microns should i put it back post pump? Pump and filter have less then 30 miles but are 2 years old+

Forgot to mention Aeromotive AFPR

Update, still have 0 views on my topic and i am kind of talking to myself. But if you are finding this in a search. do not use a 40 micron filter BEFORE the pump. i am not sure what micron is acceptable but it only worsened my situation.

For diagnostic i went to home depot and bought clear hose and put some fittings on it. to see exactly what was going on, was i sucking in dirt and rust? air?

well right after install

http://s48.photobucket.com/albums/f.../mxdawg121/?action=view&current=VIDEO0073.mp4

http://s48.photobucket.com/albums/f.../mxdawg121/?action=view&current=VIDEO0074.mp4


Then after a drive (still dropping fuel pressure but not on the first pull?)

<a href="http://s48.photobucket.com/albums/f224/mxdawg121/?action=view&amp;current=IMAG0263.jpg" target="_blank"><img src="http://i48.photobucket.com/albums/f224/mxdawg121/IMAG0263.jpg" border="0" alt="Photobucket"></a>

http://s48.photobucket.com/albums/f.../mxdawg121/?action=view&current=VIDEO0076.mp4

So i removed the filter and this is what i see

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http://s48.photobucket.com/albums/f.../mxdawg121/?action=view&current=VIDEO0077.mp4

(had fan on in backround sorry)

so the pump IS cavitating. is my sump welded incorrectly? i had it done. is there something that NEEDS to be done when adding a sump that may not have been? is it my pump? changing the position of the pump doesn't change anything (in my garage at least) and i'm hungry as hell right now , but also smell like i went swimming in a lake of gasoline.

i am technically back at square one, except i have no fuel filter at all in my system, and i have a clear hose i may just end up buying a surge tank and rigging a stock fuel pump for it somehow.

any suggestions?

 

[t4-teg]

The pump caviataing is definatly a problem. Im not sure how to correct the problem though.


Has any other DSMers ran a 044 fuel pump, and had it suck in air with the fuel? Maybe there needs to be a baffle in the fuel tank?

It kind of seems like the pump is sucking so much fuel the fuel is having a "tornado effect" and sucking in air with the fuel? idk?!?!