| Author |
Message |
Mark Collins (Markcollins)
Member
Username: Markcollins
Post Number: 366
Registered: 7-2002
| | Posted on Saturday, October 04, 2003 - 12:18 pm: | |
Billy Bob
thanks for your help, fitted the dry sump tank today and filled with oil, cranked the engine and the fuel pump pumped! |
billy bob (Fatbillybob)
Member
Username: Fatbillybob
Post Number: 363
Registered: 8-2002
| | Posted on Monday, September 29, 2003 - 9:47 pm: | |
I'm pretty sure I am right on all 348's. I know I am right on the 1991 348...I have one. Ernie may be hearing the ABS pump working in the front that sounds like a noisy fuel pump. Also the ECU controls safety fuel shut off for collisions and rollovers. The ecu does not deliver any fuel unless there is a capability for firing as in turning the key. I'm 90% sure this is how the ecu works on this issue |
Mark Collins (Markcollins)
Member
Username: Markcollins
Post Number: 352
Registered: 7-2002
| | Posted on Friday, September 26, 2003 - 12:20 pm: | |
Billy
I have the wiring diagram for a 348 and have sourced the Bosch relays and wired it identically to the diagram, assuming you are right and they don;t prime the Injectors until the engine is cranked then it's probably fine (unfortunately i can;t crank it at the moment as there's no Oil in it. Will be able to check in about a week's time.
Ernie
Your info seems to be different to Billy's so maybe I do have a problem although I can't see where.
For info on the project have a look at
http://www.collinsclan.co.uk/Pages/Cars/P4/P4.html
thanks for your contributions
|
Ernie (Ernie)
Member
Username: Ernie
Post Number: 812
Registered: 11-2001
| | Posted on Friday, September 26, 2003 - 7:04 am: | |
Well Mark as far as I know they do prime when the key is turned to "on". I was changing out the fuel filters in my 348. Well the filters that when back on were completely empty. After I connected them and turned the key to "on" I had to wait about 15 seconds until they had primed the injectors before I could start the car. It was pretty clear that they were pumping because you could hear the pump working. By the way what are you putting the motor in. |
billy bob (Fatbillybob)
Member
Username: Fatbillybob
Post Number: 357
Registered: 8-2002
| | Posted on Thursday, September 25, 2003 - 11:09 pm: | |
Mark the ECU's control the fuel pump the pumps do not turn until the key is cranked. These are very high pressure and load the fuel lines quickly. If you are doing a project how did you wire the wiring? Did you use the passenger footwell fuse box? You need this to run the fuel pump circuitry unless you custom wire right from the ECU's. Do you know haow to do that? |
Mark Collins (Markcollins)
Member
Username: Markcollins
Post Number: 351
Registered: 7-2002
| | Posted on Monday, September 22, 2003 - 1:14 pm: | |
Steve
thanks, that's worth a try, most of the other installations I've come across run the fuel pump with ignition on for a few seconds presumably to prime the injectors.
I wonder if it want's a signal from the crank sensor? |
Steve Magnusson (91tr)
Intermediate Member
Username: 91tr
Post Number: 2121
Registered: 1-2001
| | Posted on Monday, September 22, 2003 - 12:12 pm: | |
Don't know 348's specifically, but they usually don't run the fuel pump(s) on (high-pressure) injected cars with just the key "on" (it takes the key "on" + some other sort of "tach" signal to another ECU/ECU-ish/relay device to confirm flywheel motion is actually occurring). However, the fuel pump(s) usual will run when the starter motor is cranking (even without the flywheel "tach" signal present) so if you can somehow keep the other starter connections intact, but unhook the large wire/cable/tab going to the starter motor section itself (from the switch in the back of the starter solenoid), they should run when you try the "start" position (even though the starter motor won't actually turn the flywheel) -- just a thought... |
Mark Collins (Markcollins)
Member
Username: Markcollins
Post Number: 350
Registered: 7-2002
| | Posted on Monday, September 22, 2003 - 4:04 am: | |
I have a 348 engine installed in a project, todate it hasn't run since it was in it's original installation. I can't turn it over at present as I'm waiting for the dry sump tank so no oil.
I've wired the ECU's in line with the Factory wiring diagrams etc etc but when I turn the ignition on I get no fuel pump priming, the W/S manual doesn't advise whether it should or not,
Does anybody know whether the pump(s) prime with ignition on? |