well i installed an electric fpg , phantom 5760 i think is the number, this is on a tbi with stock pump, it reads 14 psi with regulator all the way in , it never changes , full throttle , idle , drivin around , always 14 psi, is this cuz thats the stock pumps limit? i do have a 190 walbro , this took me all day , ill get around to droppin that in, just wondering if the gauge is working correctly

 

2 more questions on the gauge ,it came with 2 little rubbers, one green , one red, im assuming they are for the bulb , seemed to me the bulb gets pretty hot, they wont melt? also, i have to key it twice to get it to reset, if i turn the car off it stays where it was reading , if i turn the key again it drops to zero, anyone know why?

 

I might be missing something, but that's typically what you want. Steady fuel pressure no matter what, whether your sitting there idling or gunning it down the 1/4 mile track. Do you have a vacuum AFPR?

Those little rubbers are probably for the bulb. You usually have to buy them separately, too, but it's nice they actually include them now. I've never personally used them, but I haven't heard of them melting or causing any ill effects. Then again, you never know. I'm sure someone has a better answer than I do.

That's another question that my old Autometer catalog mentions. To keep it simple, Autometer gauges use an "air core meter", in which the needle or pointer isn't physically attached to anything, so there is nothing to force the needle back to zero when you shut the car off. But, when you turn the key back on, the fuel pressure is at 0, so it drops down and reads 0.

My Autometer tach does the exact same thing. It's perfectly normal. Autometer fully explains the answer (better than I can) in their FAQs, if your interested. It's listed under Tachometer FAQs, but it still applies to most Autometer gauges:

http://www.autometer.com/tech_faq_an...x?sid=3&qid=11

 

well i might add i have a turbo city regulator, from what ive been able to gather , you can only adjust this particular regulator up to 15 psi?...........................really, it should be steady? i was doing some reading and saw where most run 16 psi at idle and 22 psi at wot...................maybe i need to be educated a bit more here

 

Those pressures are for a built up engine with a VAFPR. My current engine is running 32 @ WOT and about 22-24 at idle but also has 4.3 injectors.

 

mmmmm, ive done everything to the motor except bottom end,should i look into a different fpr? like these gm ones, is a vacuum adjustable one the way to go , or should i just leave it the way it is and i get what i get? i did notice a big difference from 12-14 psi........im wondering how much more performance i can get by playing with it

 

You'll have to do some datalogging to see. No real good way of doing it without seeing where your at now. For WOT a wide band O2 sensor is the way to go. Their expensive but worth every last penny.

 

well i put the walbro in, now i have just over 15 steady, is this fpr acting in theory like a pinched hose against the pump? can you explain to me why you have different readings at idle and wot and i dont? is it the vacuum? and i have no idea what dataloging is..........and i dont have a laptop.................id like to get more into this if its gong to make the car faster and not be too expensive, it sure is a big top end difference with the new pump , so thats a start i do have an msd heated 02 sensor, i dont think its wideband you speak of tho..........

 

VAFPR will give you more pressure as is vac referenced. dont think you want that. a steady 14 seems pretty good for TBI. i ran a VAFPR and it was a feeble attempt in getting around need for tuning. i chose to tune and run larger injectors instead of VAFPR. now if you tune and use a VAFPR that may be a diff story. one of the issues that developed is too much FP at WOT that needs to be regulated as well. can of worms.

 

i see, so 15 is pretty good? like i said i have the turbo city fpr, i was reading if i changed the spring i could go a bit higher ? would it be worth the time and effort?

 

12 -13 is where GM sets it to best of my knowledge. the idea is to keep it at that pressure for all conditions especially WOT. having more FP is not necessarily better. i would set it to 13. but if at 14 currently give that a try. higher FP will enrichen your tune all over. puter thinks it is 12.