In a message dated 4/11/01 10:12:56 PM Central Daylight Time, jtrealty@xxxx writes: > Refer to parts manual 2-1-0 part # 14 or 102359 fuel pipe. Follow to > fuel distributer and remove at the fuel distributer. Hook a temporary > pipe onto the fuel distributer and place the other end in a pail to > catch the fuel. Run the fuel pump (jump the rpm relay) and read the > PRIMARY PRESSURE. (Refer to workshop manual D:02:02 for correct > procedure). It is possible for a problem in the control pressure > circuit to cause primary pressure problems like an eroded restrictor > but I don't think that is the trouble. Until you can get your Primary > pressure under control don't worry about control pressures. Although > you ran a flow test to the tank I think you have a problem with the > return hose and even though you got good flow at the tank it had to > get past a restriction that is causing high pressures at the fuel > distributer. By disconnecting the return at the fuel distributer you > will be "bypassing" any restriction and allowing the fuel to dump > letting the primary pressure regulater work. Since you are deep in the > fuel system I recommend you go to www.motorbooks.com and order book # > 112910A for $29.95 Bosch Fuel Injection Handbook and Engine > Management. It gives a very in depth description of the operation of > the K-Jetronic fuel system and troubleshooting procedures. Be careful > in getting advice from people not specific to the Delorean. There are > slight changes in the fuel systems from car to car and what may be > valid for a Volvo for instance may not be true in a Delorean. The > Primary pressure regulater sets system pressure so if it is too high > it is only because it is not sending excess fuel back to the fuel tank > for whatever the reason. A failed cpr should not increase the system > pressure although it can reduce it. > David Teitelbaum > OK, i will be sure to try your above test tomorrow David. here's some new info: today i put a different DMC fuel pump in my tank. mine has been making strange noises, so i thought i'd put a different one in just to see if i could eliminate any doubts. well now my control pressure is around 3.0 bar, and the system pressure will slowly increase to about 4 bar, then it suddenly drops down to about 3 bar and sits around there. every time i jumped the pump it did this. it would slowly rise up to 4 bar, and right about there, in the same place every time, the needle would violently drop to about 3 bar, and that's where it would dwell at. very interesting. my old pump would go to 3.5 for control pressure and go all the way up to 6 or 7 for primary, and it jumped around in that area. got any explanations for that, David? or anyone? Andy Soma576@xxxx 1982 DeLorean DMC-12 VIN#11596 Fargo, ND 58102 [Non-text portions of this message have been removed]