DSM90AWD
DSM Wiseman
- 2,922
- 105
- Dec 22, 2002
-
Bear,
Delaware
I've just finished installing an aftermarket fuel filter/feed line and went to prime the pump to check for leaks (were none ) using my TMO datalogger's feature for the pump relay but the pump did not come on. The pump also does not come on for a few secs when ignition is turned to the "ON" position as it used to do.
The 90-91s have a separate Fuel Pump Relay mounted under the ECU (P/N E8T07071) which has two internal swiches, one I assume is for the Ignition On (to prime) and one for the Engine On. Both swiches when jumpered directly from the battery worked ok (i.e. close) so assume this is not the problem. I also took the cover off and saw no internal damage other than a slightly misaligned switch contact.
I assume the TMO Dataloger and Ignition ON swich triggers this relay, but neither seem to work (e.g. no audible "clack" as was when manually jumpered).
What could be the common break in the communication to this relay
I might add that the car starts/runs fine, so obviously whatever is wrong is specific to both the TMO Fuel Pump Relay activation and the "ON" swich of the ignition. I was thinking ECU, but I had the CAPs replaced by JeffO a few years back and was told it had no board damage.
Also the manual fuel pump relay harness (the one behind the battery) did work when applying 12V power.
The 90-91s have a separate Fuel Pump Relay mounted under the ECU (P/N E8T07071) which has two internal swiches, one I assume is for the Ignition On (to prime) and one for the Engine On. Both swiches when jumpered directly from the battery worked ok (i.e. close) so assume this is not the problem. I also took the cover off and saw no internal damage other than a slightly misaligned switch contact.
I assume the TMO Dataloger and Ignition ON swich triggers this relay, but neither seem to work (e.g. no audible "clack" as was when manually jumpered).
What could be the common break in the communication to this relay
I might add that the car starts/runs fine, so obviously whatever is wrong is specific to both the TMO Fuel Pump Relay activation and the "ON" swich of the ignition. I was thinking ECU, but I had the CAPs replaced by JeffO a few years back and was told it had no board damage.
Also the manual fuel pump relay harness (the one behind the battery) did work when applying 12V power.