This is my first summer of having a fuel pressure gauge and my pressure has dropped a little the last couple weeks. During winter i was holding 15 and it would pull down to 10-11psi wot. The last week and a half I've been making 13-14psi and pulling down to just under 10 wot. I installed the raptor this last winter so I'm not sure if it's just breaking in and i need to adjust the regulator or if the pressure difference is due to the higher temps. Been 100+ the last week and a half. I figure the diesel is just thinner due to heat causing the slight pressure drop. Any else see pressure differences during the summer?

 

It could have dropped from the heat. Or a slowly clogging filter or something like that

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I have never noticed a difference in fp from summer to winner.

 

What is the maximum fuel pressure you guys are running ? I could have sworn that I read that the VE pump wasn't suppose to have any fuel pressure > 10 PSI coming into it.

 

I am running 15psi that is supposed to be the limit for the front seal in the ve.

 

With a new filter, mine averages 3-4 psi all the time. I guess it's time to upgrade my lift pump to the 2nd gen unit.

 

Ive noticed the same thing with my '93 and the pete I drive when the temperatures around 85+. I lose a few psi across the board and power once the fuel gets heat soaked. The problem is worse when the tanks are low or halfway through the day if they have been running all day.

 

I regularly see 20psi but I have an updated, retained front seal.

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