 1975 Porsche 914 1.8 liter, fuel pump |
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| nigolusa |
 Mar 21 2009, 11:58 AM
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#1
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nigolusa  Group: Retired Members Posts: 157 Joined: 10-November 08 From: los angeles Member No.: 9,737 Region Association: Southern California  |
when first turning the key, not all the way, is the fuel pump supposed to be working?
Before installing, tested it and it spun. Now after completing the fuel tank installation, lines etc., I cannot hear it functioning. Is this a relay problem? Or does it spin after the engine starts? (IMG:style_emoticons/default/headbang.gif) |
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| Cevan |
Mar 21 2009, 07:03 PM
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#2
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
Here is a very good explanation of how the dual relay works, including easy to follow diagrams.
You can test the relay and the harness. Unplug the relay and test each side. Put 12 volts to 86c and ground 85. You should hear it click. You should have continuity between 88z and 88a and between 88z and 88b when that side is powered. On the other side, put power to 86a and ground 85. Again you should hear a click. You should have continuity between 88y and 88d and between 88y and 88c. With the relay unplugged, test the relay socket to see if you're getting voltage to the relay. You should have 12 volts at 88z and 88y, even with the key off. Turn the key to on and you should have 12 volts at 86c. In the starting position you should have 12 volts to 86c and 86a. |
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| nigolusa |
Mar 22 2009, 12:06 AM
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#3
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nigolusa Group: Retired Members Posts: 157 Joined: 10-November 08 From: los angeles Member No.: 9,737 Region Association: Southern California |
QUOTE(Cevan @ Mar 21 2009, 06:03 PM)  Here is a very good explanation of how the dual relay works, including easy to follow diagrams. You can test the relay and the harness. Unplug the relay and test each side. Put 12 volts to 86c and ground 85. You should hear it click. You should have continuity between 88z and 88a and between 88z and 88b when that side is powered. On the other side, put power to 86a and ground 85. Again you should hear a click. You should have continuity between 88y and 88d and between 88y and 88c. With the relay unplugged, test the relay socket to see if you're getting voltage to the relay. You should have 12 volts at 88z and 88y, even with the key off. Turn the key to on and you should have 12 volts at 86c. In the starting position you should have 12 volts to 86c and 86a. Relay checks out fine. How do I check the AFM harness is getting current at the ON position? |
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Posts in this topic
nigolusa 1975 Porsche 914 1.8 liter Mar 21 2009, 11:58 AM
echocanyons It should spin while cranking.
You may also manua... Mar 21 2009, 12:09 PM Cevan Answer: no. With the key in the on position, the ... Mar 21 2009, 01:23 PM
nigolusa
Answer: no. With the key in the on position, the... Mar 21 2009, 02:54 PM nigolusa I pushed the flap on the air flow meter, but nothi... Mar 21 2009, 03:13 PM Cevan
I pushed the flap on the air flow meter, but noth... Mar 21 2009, 04:11 PM nigolusa
I pushed the flap on the air flow meter, but not... Mar 21 2009, 04:24 PM SirAndy
Mind you, I haven't put any gas into the tank... Mar 21 2009, 11:28 PM zonedoubt This a good article on the double relay: http://ww... Mar 22 2009, 11:14 AM |
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