just noticed this on lmc truck's site. item #12
http://www.lmctruck.com/icatalog/fd/0042.asp

gas: $15
diesel: $35

again, i don't need one, just wondering what's different. i just assumed both worked the same

 

On fuel injected gas engines the pressure it between 30 and 60 psi, depending on what you have. On diesels it is somwhere in the 5 to 15 psi range out of the tank to the injection pump.

 

I think this is just the switch in the dash though, not something that actually comes in contact with fuel. If that's the case, what makes them different that creates the price difference?

 

agreed, thats what i'm asking. seems to be just an electrical "A or B" kind of switch and the differences would be further down the line.

 

$15 for the gas switch?!?! I wish I would've found that before I spent $41 on it at the stealership..

 

bump. any guesses or are we all stumped. could be the psi deal i guess but that just didn't make much sense to me being an electrical switch and all. doesn't really matter, just curious.

 

The only difference I could imagine there would be is if the diesel engines have a different electrical system for the fuel system, such as having another relay or something thrown in the mix, which very well might be the case. But as far as I know, the switch in the dash of our trucks just switches between completing the circuit to the front fuel pump or the rear fuel pump. Come to think of it, maybe the diesel switch has a higher load capacity...

 

I am going to agree with Skandocious, I don't think that it may be wired differently, but don't the deisels have two batteries? That would mean more amps. That would be my guess cause they are both 12V.

 

If I was ford i would have just put the higher load switch on ALL the trucks. just seems like it'd save a lot of hassle and perhaps some money. i guess they knew what they were doing though. ...if the above is true

 

Do remember Tom that automobile manufacturers are always looking for ways to cut cost (some cars more than others), and it would most likely cost Ford more money to put high amp switches in all the trucks, even if the price is somewhat negligible.

Say, for the sake of argument, that the high amp switches cost an extra dollar to produce, 1 lousy dollar amongst the thousands that it costs to produce the whole vehicle. And say for the sake of argument, that Ford sold 1 million F150s between 92-96. Well that little unnecessary upgrade to the high amp switch just cost Ford a cool million bucks. And I'm sure that my numbers here are far lower than the actual figures. So you can see that even very small cost cuts can mean HUGE savings for Ford, especially in places where the average consumer would NEVER see them, such as a fuel switch

 

Point taken. Thanks for the clear-up guys. I guess we're going with the higher amp theory.