my eternal fuel woes

[Soma576@xxxx]

Hey All,

lately things have been really strange with my fuel pressures. it seems like 
every time i remove a hose to inspect it and then replace it, it changes my 
fuel pressures! for example, yesterday i removed the hollow bolt on the 
return side of the fuel distributer as well as the primary pressure regulator 
pin and the frequency valve sending hose. after i put it back together (i 
know it's the correct way i might add), my pressures have been like 1.25 bar 
for control pressure and .25 bar for primary pressure. then as soon as i 
turn off the pump, the rest pressure goes up to about 2.5 bar. WTF!?!?! 
this would imply that now some part is jammed open or something. these 
reading would be consistant with having a major fuel leak somewhere, but i 
have checked the whole system and i'm not leaking a drop. first i had 
insanely high pressure, and now i have insanely low pressure!!!

i checked the polyeurethane hoses that connect to the pump. i had to snip 
both of them and put the banjo fittings back on further up because i didn't 
realize that i had been twisting them while doing all this work with the 
pump. also, i did another flow check - and i'm STILL getting 2 liters in one 
minute. i took all those hoses off again, and put them back on, rearranged 
the pressure tester, etc etc etc, and the pressures are still really really 
low. 

one thing i'm concerned about is that the new pump that i have in for testing 
is the older one without a dome nut. the only way i could get it to work and 
not leak with my parts was use the non dome nut bolt that came with it, then 
use my banjo fitting on the pickup hose with two brass washers on either side 
of it. i'm a little concerned that this isn't exactly the right hookup parts 
and i wonder if it's not working quite right. but the pump sounds very 
healthy and according to my flow test, i'm not getting restricted. 

today i swapped control pressure regulators with one that i know works. it 
DID NOT changes any of my pressures at all. the car behaved the same with 
mine and with the other one. i do not think that CPR is the problem now. 

here's what i propose - i believe it is about time that i started dismantling 
some stuff. first start at the return lines at the fuel distributer, get an 
air compressor, and check for blockage, just blow air through them and see if 
it comes out the other side i guess. check for bubbles in the gas tank. if 
that checks out, it may be time to disconnect all the fuel hoses and do them 
all. take off the fuel distributer and make sure that is clean too (even 
though every time i've looked at it, it looks excellent).

any other ideas, short of getting it towed to an import dealer?

Andy

Soma576@xxxx
1982 DeLorean DMC-12 VIN#11596
Fargo, ND 58102


[Non-text portions of this message have been removed]