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Join Date: Sep 2004
Location: Tonawanda NY
Posts: 964
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fuel pumps not firing
Engine has been reinstalled, turns over and seems ready to bite but the fuel pumps are not running with the cranking of the starter.... Can get them running individually by using my test relay(one with cover removed) but they won't respond to the meter plate being depressed and ignition 'on' either. Now I'm getting depressed...
 What am I missing here??? Think I'll sleep on it. So close... Thanks! Tom
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud |
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06-13-2010, 07:35 PM
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Join Date: Oct 2006
Location: Mt Pleasant, SC
Posts: 1,168
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Is the plug connected to the back of the throttle body assy?
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Tim 1986 930 Gone:71,2,4 914's, 70T, 71T(RS),77S |
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06-13-2010, 07:41 PM
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Join Date: Jul 2008
Location: Central Washington State
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Quote:
Slyguy, did you forget to connect the single wire to the overboost pressure sensor on the boost recirc manifold? That wire must be grounded (through the normally closed sensor switch) for your pumps to run. And what's this test relay you refer to? Replaces the yellow troublemaker? I presume you've checked the fuel pump fuse up front in the fuse tray?
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. Last edited by mark houghton; 06-13-2010 at 08:04 PM.. |
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06-13-2010, 08:02 PM
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Location: Tonawanda NY
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Quote:
Fuel pump fuses fine, did the Rice mod some time back... Overboost switch has no effect plugged in or unplugged... overboost pressure sensor grounded as it has always been... My test relay is simply one with the cap removed allowing you to manually power it up, very handy to have around! 
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud Last edited by slyguy; 06-14-2010 at 12:09 PM.. |
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06-14-2010, 12:06 PM
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Location: Tonawanda NY
Posts: 964
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just pulled the green plug for the cold start valve and the pumps run continuously. the yellow blue wire at the hi torque starter is not connected to anything (and hasn't been even when the car was running pre engine drop) could this be a factor?
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud |
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06-14-2010, 04:28 PM
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Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,434
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The connector for the "cold start valve"? I would have thought it would be the metering plate switch. With it unplugged, the pumps run with the ignition on?
The wire from the starter powers "something". Do you have a wiring diagram? Quote:
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06-14-2010, 04:59 PM
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Join Date: Sep 2004
Location: Tonawanda NY
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I, am an idiot... duh, had the plugs reversed... thanks rocket! Time for a little early evening motor run in! YEEEE HAHHHH!
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud |
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06-14-2010, 05:17 PM
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Join Date: Jul 2008
Location: Central Washington State
Posts: 4,412
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OMG! That was too simple. That cold start valve - plugged in or not - won't stop your pumps from running, but may make it a female dog to start.
I don't know if this even warrants admission to the "won't start" sticky!!! Best we forget it. And to think, I haven't been sleeping nights trying to figure this one out. I'll buy you a Scotch, next time you're just "passing through" Washington State. Happy for you Sly! How many times have I slapped my forehead, saying DUH!
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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06-14-2010, 06:49 PM
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Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,434
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^^^^. I was thinking the same thing. No add to the Sticky for this one!
Glad it's fixed. Have fun!!! |
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06-15-2010, 10:14 AM
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Join Date: Sep 2004
Location: Tonawanda NY
Posts: 964
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Ran the car in the other night, changing the oil, checking the newly added turbo sump filter for garbage, powering up the LM1 and should be ready for some break in miles and re-tuning. Regarding the no-start thread well lets just say if anyone ever suspects they have the plugs reversed I'd be happy to help them in straightening them out. I'd consider myself to be very knowledgeable in this area. Perhaps an 'I think I have my connectors reversed' thread would be in order???
Tom
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud |
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06-16-2010, 10:47 AM
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