Hi John, Brian gives excellent advise. While your diagnosis was pretty thorough, putting power directly to the pump will eliminate the obvious. No matter what advise you get here or at the AlfaBB, you really need to get the correct wiring diagram and go through the entire circuit. BUT, that said, and if you prove the pump is working by directly powering it, there is one shortcut you could take. You are dealing with a L-Jet car and so could swap in a known good combination relay. The only time I have ever had to have my GTV-6 towed was when a the combi relay became flakey. I would offer to lend you my known good spare but it is out on (possibly permanent) loan right now. I try to keep a spare for diagnostic purposes. Must be a good idea, I can't keep hold one! One additional comment about the voltage at the pump. As Brian says it is low. You should see battery voltage at the pump. Your not so, I highly recommend you fix that, The car will run better. First, you may have been cranking to try to restart so the battery may be low. But 9v is way low, no way is that battery voltage. Trace out the circuit and you will find either corroded connectors, a weak ground or maybe even a relay with toasty contacts. Tackle it once you get the car running again and you will see a difference. Hope this helps. Feel free to contact me directly if I can help. I like this forum to be technical and helpful. It is not very active but I still like it. Scott Shure85 GTV-6Scuderia Saab On 01/08/15, alfa-digest<[email protected]> wrote: alfa-digest Thursday, January 8 2015 Volume 10 : Number 2726
Forum for Discussion of Alfa Romeos, etc. Richard Welty <[email protected]> Digest Coordinator Contents: [alfa] Testing fuel pump in '86 Spider Quad Re: [alfa] Testing fuel pump in '86 Spider Quad [alfa] administrivia: Powell's Books Alfa Digest Home Page: http://www.digest.net/alfa/ Send submissions to [email protected] Send administrative requests to [email protected] To unsubscribe, include the word unsubscribe by itself in the body of the message, unless you are sending the request from a different address than the one that appears on the list. Include the word help in a message to alfa-digest-request to get a list of other majordomo commands. ---------------------------------------------------------------------- Date: Sun, 4 Jan 2015 15:38:35 -0800 From: "John and Deb Dohrmann" <[email protected]> Subject: [alfa] Testing fuel pump in '86 Spider Quad My spider was running OK until it died at an intersection and since them won't start, cranks fine but doesn't fire at all. Compression, fuel and spark, right? I read online that the fuel pump should come on if I turned the key to run and then pushed open the air flow sensor flap. Put a remote mic on the pump, turned key on and opened air flow flapper, nothing from the pump. Ran a wire to a meter from each wire at the pump, tested against ground with key on, flapper open, no volts. Fuse by the brain box is good, I can hear the main relay click when I turn on the key, so makes me suspect the drive relay. Just to be sure, I put everything back together and cranked the engine listening to my mic on the pump - all I could hear was the starter noise. Again, makes me suspect the drive relay. But just to be sure, I hooked a jumper from each side of the pump and measured against ground while cranking the engine, now I have 9 volts to the pump. So the article saying that opening the air flow flapper with the key to on will run the pump is NOT correct. And if I have voltage to the pump but no pump whine, then it is the pump, not the relay. Any suggestions would be appreciated, especially how to test the fuel pump function while in the car without cranking the engine. Thanks John Dohrmann 1986 Spider Quad ------------------------------ Date: Mon, 5 Jan 2015 02:15:42 +0000 (UTC) From: Brian Shorey <[email protected]> Subject: Re: [alfa] Testing fuel pump in '86 Spider Quad I can't remember if the flapper on the Bosch Spider works the same as theB flapper on the GTV6.B It should.. Two things to try: 1) Make sure theB pump is grounded properly.B I'd unbolt the wire, clean it, andB reconnect it just to be safe.B If there are only 9v at the pump and not 12v, that could be a bad connection somewhere that's not carrying enough current to power the pump. 2) Try applying 12v directly to the pump.B Hook it up to a spare battery, or just power it via some long test leads directly from the battery in the car.B If the pump runs with 12v going in, then your problem is not the pump.. bs B From: John and Deb Dohrmann <[email protected]> To: [email protected] Sent: Sunday, January 4, 2015 3:38 PM Subject: [alfa] Testing fuel pump in '86 Spider Quad My spider was running OK until it died at an intersection and since them won't start, cranks fine but doesn't fire at all. Compression, fuel and spark, right? I read online that the fuel pump should come on if I turned the key to run and then pushed open the air flow sensor flap. Put a remote mic on the pump, turned key on and opened air flow flapper, nothing from the pump. Ran a wire to a meter from each wire at the pump, tested against ground with key on, flapper open, no volts. Fuse by the brain box is good, I can hear the main relay click when I turn on the key, so makes me suspect the drive relay. Just to be sure, I put everything back together and cranked the engine listening to my mic on the pump - all I could hear was the starter noise. Again, makes me suspect the drive relay. But just to be sure, I hooked a jumper from each side of the pump and measured against ground while cranking the engine, now I have 9 volts to the pump. So the article saying that opening the air flow flapper with the key to on will run the pump is NOT correct. And if I have voltage to the pump but no pump whine, then it is the pump, not the relay. Any suggestions would be appreciated, especially how to test the fuel pump function while in the car without cranking the engine. Thanks John Dohrmann 1986 Spider Quad - -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected] ------------------------------ Date: Thu, 08 Jan 2015 07:30:02 +0000 From: Richard Welty <[email protected]> Subject: [alfa] administrivia: Powell's Books Other ways to support the digest Richard's Amazon wishlist: http://www.amazon.com/wishlist/30PQXKZQN9GWX/ref=cm_wl_rlist_ go (there is more than one list on amazon, see the menu on the left). Powell's Books affiliate: Krusty Motorsports (parent of digest.net) is affiliated with Powell's Books, a highly regarded bookstore in the Pacific Northwest. Use this link to access Powells and buy books, and it'll help: http://www.powells.com/cgi-bin/partner?partner_id=25667 ------------------------------ End of alfa-digest V10 #2726 **************************** -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
