extra fuel pump relay in a 62

[Living in the Past]

I have a 1989 FJ62 that I've had since 1993, about five years ago the fuel pump when out. While trouble shooting I found out how the fuel pump is operates, pump is turned on while starting and is held on by air flow sensor. This use to be one of my main drivers but now it's a toy like the rest of my cruisers. For emission and insurance reason it lives at my cabin in Northern Arizona and only gets used every couple of weeks on the weekend. Most other fuel injected vehicles you hear the pump prime the fuel system when the key is turned on, not the 62s, I don't know about the 3FE 80s. I'm thinking of installing a push button switch or a relay like a seat buzzer that stay on for about five seconds when the key is turned on to prime the fuel system. Would this shorten my starting time with a vehicle that sits alot and can anyone see any harm in doing this? After it starts it still would kill the pump if the flow sensor isn't seeing flow. I know on my FJ25 the hand pump feature on the fuel pump shorten the starting time greatly.


John

 

[batman]

Thats a great idea. If my 62 sits over night mine takes 4-6 seconds to start. If I were to put in a switch that would prim the system before it starts would greatly improve the start delay. Let me know what you come up with....

 

[yooper]

Should work fine, but your pump died because the fuel pressure regulator is failing closed. Replace the FPR or your existing pump will die too.

https://forum.ih8mud.com/showthread.php?t=6464

 

[archie]

Here's a thread talking about the engine being primed for oil before the fuel pump goes on. Something you might want to consider in the modifications.
https://forum.ih8mud.com/showthread.php?t=19757&highlight=crank+start+times

 

[Living in the Past]

Thats a interesting thread. I thought About doing a oil prime too. I think they make adapter that is for a oil cooler that fixs between the block and the oil filter. Use the ports from that adapter for a electric oil pump to prime the circuit and then switch out of the circuit while the engine is running otherwise the pump would be a restriction on the oil circuit, also won't work on the F engines thru 1973 because they were not full flow thru the filter. Oil that when thru the early fiter was just dumped back in the the oil pan not much prelubing that way. Just sounds like alot of work. Thought I would try the fuel system first. The bottom line is to shorten the time that the engine is turning over without oil flowing thru the bearings. I will say that at 100K (120K now) I replaced the rod bearings because of what I sure is a lifter noise. Wanted to be sure it wasn't a rod bearing. All six rod bearings were in new spec not just exceptable. I have always work on f engine before this interesting how the block is marked, just don't ask for a set of standard size bearings you have to have the mark for each rod bearing.

John