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Fuel Pump

I noticed that when my 460 is idling the see-through fuel filter does not stay full. It will go close to empty and then refill. Also the fuel pressure goes form 6psi to 3-4 psi after the engine is warm, is this normal?
 

73F100Shortbed

That's how we roll!
5,937
320
NJ
I never looked at my fuel filter to see if the same thing happens but it seems logical since the engine isnt spinning as fast at idle so I would think the pressure may drop like you say. Are you having any actual fuel related issues or did you just notice this by accident?
 
I never looked at my fuel filter to see if the same thing happens but it seems logical since the engine isnt spinning as fast at idle so I would think the pressure may drop like you say. Are you having any actual fuel related issues or did you just notice this by accident?

Just noticed after I reinstalled my carb. I suppose I should rev the engine up to see if the pressure comes up!
 

BuzzGun79

Nov.TOTM 2012 / 2012 TOTY
2,388
55
fuel pump pressure on 8 cylinder fords should be between 6.0 - 8.0 according to the manual for these trucks.my 79 460 runs 6.0 at idle,it should not drop below that.my pump is brand new.your pump may be getting weak,or you have a restriction in the line.
 
Last edited:

dakonthemountain

California Chapter member
fuel pump pressure on 8 cylinder fords should be between 6.0 - 8.0 according to the manual for these trucks.my 79 460 runs 6.0 at idle,it should not drop below that.my pump is brand new.your pump may be getting weak,or you have a restriction in the line.

smilieIagree However it is normal to see air space in the filter... at least in all the filters I have every had, including in perfect running newer vehicles..

Dak
 
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