fuel pressure again

[randyswelding]

ok so i got my gauge in finally and it is with an air dog 100 with a 15psi spring in it,the problem is its showin 7psi at wot and idel which is good but it still dies and the gauge reads 7 until it dies,with the key still on i got 0psi and wont start but if you let the key on for a lil it will have 7 and with enough crankin it will start. im confused i did get a mechanical gauge from isspro and when puttin in the isolator it looks like the 2 halves split a lil and is leakin fuel any ideas?i already had the spring out of the airdog and streached it alittle and still 7psi and still dies,thoughts things to try heck it only has 2k on the airdog unit,any help thanked luckly its warm out side and i got the harley but need the truck up.thanks guys

[SNOOT]

How did you plumb it in? Got pictures?

[randyswelding]

Its a 1/2" billit T with a 1/4" to 1/8" adapter and 1/8" line plumbed in 1" back from the ve I got pics on my phone snoot. I took out the isolator and am runnin 13 to14psi now at idal and 8 at wot I havnt checked to see if itd die yet since I haven't hooked up the lights for the gauge. Should I run the isolator or not?

[PToombs]

I don't have an isolator in mine. I just sleeved the part of the tubing in the cab with a larger tube. Then if it leaks the fuel will run back outside.
I was too cheap to pay $65 for an isolator.

[randyswelding]

thanks ptombs, i decided to turn the pump down 1 turn on the fuel screw and the dang thing still dies i got 8-10 psi and when you push the clutch in at wot it will die,then the pressure drops to 0 psi and its a pain to start(lots of crankin)but will start and stumble for a bit with 12psi.and when i pulled in to the drive at idal was pushin 9-13psi.what do i need to check next im stumped on this one

[PToombs]

Does the AD run all the time? If the pressure is dropping off then there is a problem there. I have a buddy who put one in and his runs all the time. His is plumbed direct to the VE inlet, and the AD return goes to the filler neck with a T. The other thing I'm wondering about is the shut off solenoid. Because it dies when you push the clutch. If you have even 1 or 2 psi, it should run.
I think you have 2 problems and need to kinda figure out what's what and seperate them.
Hope this helps, good luck!

[randyswelding]

it runs all the time with the key to the on possition and when it dies it has 8psi still,the only time it goes to 0 is when im crankin for a while on it,its plumbed in to the inlet of the pump and thats where i t d off for the pressure and i did the addapter for the return and it still dies,i did put the plunger back in on the shut off sylinoid so im gona try and take that back out and see what it does.when i push the clutch in it still has 8psi then dies with that

[PToombs]

Which return did you T in? You do realize that the AD has it's own return for the fuel bypassing the regulator internally? There should be 3 1/2" hoses to the AD. Or am I misunderstanding your plumbing?
If it drops to 0 at all, there has to be a supply problem. If the pump is running, it should keep constant psi. Could you be losing voltage to the AD when cranking?

[randyswelding]

ya the return is goin to the fuel inlet on the tank where you fill it up at then the other 2 one is a supply and to the ve, i got to check the voltage to the ad on the 9th of may ill have more help then.how would i check the wolts when it does die i cant get stoped fast enough to check that unless i check it at the fuse holder on the fuse block

[PToombs]

Tap in another wire to the hot at the AD, then run it to the cab and put a guage on it, or tape it to a multitester. That way you can read it all the time. Then when you get it fixed, just pull it out.

Maybe check the grounds too.

[randyswelding]

heck theres only one ground and the relay i got the paint off of the body.i got to get a shower im goin on a date and the first time its not to work on a truck or any thing this one is a girl though i cant remember her name

[PToombs]

Well, tap that 1st and worry about the wires later! Have fun!

[randyswelding]

ok i got thinkin about it and it goes to 0psi when in cranking which means i got to find another place to tap the trigger wire in to where its hot when cranking and not when the key is off.is there a chance that the ve is about dead?it has around 340-400k on the clock if my math is right the gauge shows 268k and in the back of the speedo it has another tap from a company from minnisota with 139k writen on it so i dont know the exact milage and its been almost maxed out for around 35k could it be dead heck when it dies with 8 plus psi

[randyswelding]

or could it be a restriction with the old in tank filter and plastic tube?i used the sticky from dtr and instead of 3/8" line in faver of 1/2" line with the stock filter and plastic piece. i did get a draw straw the other day i might be able to put that in on the 9th and see if that helps,i do know that the 6x16 injecters wont help but will be fun on the 9th

[PToombs]

Try to feed your relay from the shut off solenoid wire. That should have power when in "run" or "start" position. It doesn't take much to run a relay either.