 L-Jet fuel pump relay, why did they bother? |
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| High Path |
 Jun 25 2010, 10:53 AM
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#1
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Newbie  Group: Members Posts: 26 Joined: 29-June 09 From: Edina, MN Member No.: 10,516 Region Association: Upper MidWest  |
After spending many hours wrestling with a fuel pump issue, and wasting a lot of time on relay #75 on the relay board. and ultimately discovering that relay doesn't run the fuel pump on an L-jet car, I have to ask... why the heck is it even there if it isn't used?
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| underthetire |
Jun 25 2010, 11:14 AM
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#2
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
I think I know the answer, but since i'm a Djet guy I can't answer. sorry. (IMG:style_emoticons/default/slap.gif)
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| Cevan |
Jun 25 2010, 11:51 AM
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#3
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
I think once they designed the relay board for the 1970 D-Jet cars, they never changed it. L-Jet doesn't use the fuel pump relay on the relay board.
Go here to learn how the double relay works. |
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| ClayPerrine |
Jun 25 2010, 11:56 AM
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#4
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Life's been good to me so far..... Group: Admin Posts: 15,523 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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Typically auto maunfacturers have a bunch of parts in stock as completed sub-assemblies. The relay board, complete with the relays, fuses and voltage regulator was probably like this. So when they put the L-jet injection on, they didn't bother to remove the unneeded relays.
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| charliew |
Jun 25 2010, 08:48 PM
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#5
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
Thanks for the samba link that is interesting.
It seems that the gm idea of using the dual oil pressure sender to hold the fuel pump energized while the oil pressure is up is a simpler way to do it to me. |
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| jim_hoyland |
Jun 26 2010, 09:16 AM
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#6
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Get that VIN ? Group: Members Posts: 9,320 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(Cevan @ Jun 25 2010, 10:51 AM)  I think once they designed the relay board for the 1970 D-Jet cars, they never changed it. L-Jet doesn't use the fuel pump relay on the relay board. Go here to learn how the double relay works. Great link for the dual relay, thanks for sharing. Is there a similiar explanation for the relay(s) under the passenger seat ?? |
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| Katmanken |
Jun 26 2010, 11:05 AM
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#7
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Seatbelt relays,
It's another poorly thought out part of the all encompassing desire of the Government to help you whether you want it or not. For those of you that fail to buckle your seatbelt, the under the seat relay is designed to make you to follow the law by preventing the car from starting. Move the car from the drive into the garage? Buckle up or no starty. Try to see if the engine will start after you worked on it all day? Buckle up or no starty. To make it especially insidious, there are pressure sensors in the seat. They are also hooked to the relay. The pressure sensors are another of the the Government's way of protecting you. No ass in the seat, no starty. If you are trying to start your car after working on it, both the belt must be buckled, AND your ass must be in the seat. Fail to do both of those, and you can waste a lot of time and money fixing things that aren't broke. Did I mention hit a bump while driving????, That's real fun. The bump can cause the seatbelt relay to drop, and that kills your engine. So if you are accelerating while trying to merge in front of an 18 wheeler that's doing 75 and you hit a bump, the Governments infinite wisdom will allow your relay to drop and your car to die right in front of the oncoming speeding truck. But no worries, your buckled seatbelt will keep you safe as you get run over by ALL of the the 18 wheels. Or, simply break the law by pulling the seatbelt relays and jumpering the yellow wires. |
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