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fuel pump, relay, check valve diagnosis help needed 200 1983

uid 18083's pic
posted by  lucid on  Sun Sep 28 04:04 CST 2003
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I had another reply almost done, then lost it to a keying error. But here are some quick thoughts:

1- What type Fuel Injection? If it's LH 2.0, Fuse # 7 is NOT in the fuel pump circuit, which is: 25 AMP fuse to Relay 30, Relay 87 to Fuse #5 "hot side" (left) to Main Pump.

Jumping any fuse (6—10) hot side to Fuse #5 hot side will bypass every thing and put full voltage on both pumps, injectors and Idle Control Motor, just as though it came from the relay. But don't do it for long, as the jumper is carrying the whole load. Just do it to see if you get better voltage at the Main pump.

2- The "initial prime" (quick fuel pump buzz") is an Urban Legend. It will happen on some older cars, but is not an intentional part of the FI operation. So I wouldn't consider it when shooting a starting problem (even though it has been implemented on later cars, as my '93 940).
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and still here)
New 144 from '67 to '78
Used '62 122 from '63 to '67






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