 1975 Porsche 914 1.8 liter, fuel pump |
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| nigolusa |
 Mar 21 2009, 11:58 AM
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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, 01:23 PM
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
Answer: no. With the key in the on position, the fuel pump will only run if the flapper on the airflow meter is pushed open (even just a little). When the key is the start position, the dual relay will power the fuel pump. Once the engine starts abd the key returns to the on position, air entering the AFM will keep the flap open and the fuel pump powered.
You can test the pump by turning the key to on and then pushing the flap open. That should make it run. You should hear the dual relay click on also. |
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| nigolusa |
Mar 21 2009, 02:54 PM
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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, 12:23 PM)  Answer: no. With the key in the on position, the fuel pump will only run if the flapper on the airflow meter is pushed open (even just a little). When the key is the start position, the dual relay will power the fuel pump. Once the engine starts abd the key returns to the on position, air entering the AFM will keep the flap open and the fuel pump powered. You can test the pump by turning the key to on and then pushing the flap open. That should make it run. You should hear the dual relay click on also. Thank you Kelly and Chris. I will try and see what happens (IMG:style_emoticons/default/grouphug.gif) |
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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 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 Cevan Here is a very good explanation of how the dual re... Mar 21 2009, 07:03 PM nigolusa
Here is a very good explanation of how the dual r... Mar 22 2009, 12:06 AM zonedoubt This a good article on the double relay: http://ww... Mar 22 2009, 11:14 AM |
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