Engine/Transmission (1998.5 - 2002) If you have a Mech Fuel Press guage, get rid of your isolator!

[Hohn]

My FP gauge has been acting up since I installed it. Especially in hot weather, it would peg the gauge, read negative values, or read like 25 psi! Moreoever, the gauge wouldn't move when I got into the fuel pedal!



So I decided my connections were leakproof enough (braided stainless to gauge) to chance running without an isolator. So I took it out. Guess what? It had diesel fuel on both sides anyway, so it wasn't "isolating" anything.



The scary part is that it looks like my VP swallowed that antifreeze crap that was in the line (on the "gauge" side of the isllator) at some point.



Since it took out the isolator, my FP is up about 1psi all the time. 17psi at idle, 13-13 cruise, as low as 3psi WOT!



Now I need to order the max flow fuel ines from Wildcat!



Justin

 

[KLockliear]

Depends on the isolator quality. A good one should not give you problems at all.

 

[OL RATLR]

Mech Fuel Press Guage

I been running Mech 2yrs no Isolator with no problems. Oo.

 

[Joseph Donnelly]

I'm running the Diesel Dynamics isolator and have no problems with it. I like the safety factor with an expensive new truck.

 

[illflem]

Six years on two trucks with no isolators and no problems.

Just $4 needle valve at the head of the line shut almost all the way down will reduce any leak to a drip and can be shut down completely if necessary. Side benefit is the valve will eliminate any gauge pulsations or noise.

Sometimes the simplest way is the best, an isolator is just one more potential problem.

 

[RThompson]

Another vote for the $4 needle valve!

 

[Hohn]

I might have to install a needle valve on my 1/8" NPT fitting. Seems like that would be a good place.



I really like the Hewitt FP gauge I got from Enterprise, but I think their isolator needs a little improvement.



Next time I call EE, it will be for B1/B2 twins...



Justin