Fuel pressure

[jwc9]

Just installed isspro fuel gauge and the pressure seems low. 5psi at idle and at wot zero. Should I be looking for a new pump? I have a diablo predator set on 60hp. Thanks

 

[hotram03]

If your fuel system is stock and by this I mean still using the factory lift pump, thats about right, with your box @ WOT it should pull down to around 1-2 psi, add another power adder and you will be in the red. Good luck.

 

[RMalone]

Yep, stock lift pump and you can suck it to zero EASY, mine was at 8psi idle with the stock lift pump.

 

[jwc9]

UPDATE. I wanted to see if I set it back to factory that the pressure would be better. No, it did not help. It was exactly the same. Duringa 200 mile trip todayit got worse with the factory tune. The pressure dropped to 2psi at idle and cruise and any push on the throttle made it zero. I even changed the filter again just to be sure and no change. Guess its time for a pump.

 

[STEVEBROOKS]

jwc9,

Where did you get your gauge from, and where did you plumb it into?



Thanks,



Steve

 

[jwc9]

Diesel manor. Isspro gauges. And called them today. Somehow the instructions for the fuel isolator did not make it to me and you are to put a little antifreeze into the top of it for it to function properly. I explained the problem and they knew exactly what was wrong.

 

[lcaad1249]

Could also be where you're getting your fuel pressure from if its after the filter, it could be an old filter.

 

[jwc9]

No, wasnt the filter it was new. Just as I said it orks now since I put the antifreeze in the top of it.

 

[Ram Rod]

So what kind of pressure are you getting??

 

[jwc9]

10psi at idle and 5 cruising.