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Discussion Starter · #1 ·
I am putting an electric fuel pump into a '75 ElCamino. (LSx engine). I want to use a fuel pump relay that will sense when the engine quits and shut off the pump. I know that many vehicles had this type of relay (I presume that newer vehicles do not use this type of relay, but are controlled by the computer instead).

I'll probably get something out of a wrecking yard - I would like to get a relay AND socket.

Any suggestions as to what vehicles to steal this from? Reliability & availability are the two obvious issues that come to mind.

Again, I'm not looking for a normal relay, but an actual "fuel pump relay" that senses when the engine quits and shuts off the fuel pump.

Thx
Scott Kelley
 

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Scott..I will watch this post also.I do not know of any stand alone relay that senses engine stall.If such a beast exists..then I want one also.Maybe a manifold vacuum referanced diaphram/switch could interrupt the ground side of the relay coil?The downside would have no carb prime during cranking perhaps..but the fuel bowls should be full and allow start up anyhow.It is a great question that airs on the side of safety in a rollover especially.Hopefully someone chimes in.:thumbsup:
 

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bigfred..great link.In a rollover..the pump would starve and open the ckt.Easy to tee in with a mechanical gage also.Draining the pan thru the traps will not win races ..but save the bottom end with this sensor.I forgot about the oil burning vega.Looked at the oil pressure switch today as a redundant ckt to back up a relay fail while running.
 

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I am putting an electric fuel pump into a '75 ElCamino. (LSx engine). I want to use a fuel pump relay that will sense when the engine quits and shut off the pump. I know that many vehicles had this type of relay (I presume that newer vehicles do not use this type of relay, but are controlled by the computer instead).
Really has nothing do do with the type of relay, but more to how its wired. Like skinning a cat, there are many ways to wire a relay, you can have the fuel pump turn on only when there is oil pressure, only when the key is on, or have to have both key on and oil pressure. Pick the way you want it and me or someone else can show you how.

Scott Kelley said:
I'll probably get something out of a wrecking yard - I would like to get a relay AND socket.

Any suggestions as to what vehicles to steal this from? Reliability & availability are the two obvious issues that come to mind.
Most newer cars don't have individual relay sockets, they have box which holds many relays (and fuses). If you only plan on adding this one relay, I would just get a relay kit, if you plan on adding more just take the box (electrical center) from a late model. Search username "vrooom3440" in this forum, I believe he also has pics of his setup.
 

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Discussion Starter · #6 ·
I know that Bosch makes such a relay - used on CIS equipped cars - turn on the key, the pump runs for a few seconds, then the relay is energized as long as there is a tach signal to one terminal. I believe that other mfgs also had a similar relay, & was hoping that someone might know of an application where this relay was mounted in its own socket, and where this relay was more reliable than the Bosch relays...
 
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