Bobbo

iTrader: (4)

i have had my blue in for about a month while putting the car together, i have had the pump going all of 5 times in the last month, worked great each time... i finally get the car together to take it for a drive and the pump takes a ****........... fuel draws from the sending unit in the tank, through one filter, through the pump, through the fpr, dead heads into the carb........

it fluctuates from 0-2 1/2 psi sometimes bouncing back up to 3 (preset)... it's a brand new pump by the way...

so far i have

1. hooked the pump up to a bucket full of gas..... still bad
2. hook the pump back to the tank but removed the exiting side and put it in a bucket.... still bad
3. ran the pump from and into a bucket of gas.... works great
4. hook it all back up in the car.... worked great for about 2 minutes

voltage is good on it, i don't know what else to check... i haven't seen any debris in it, i dont know..... guess tomorrow if noone has a good solution i'll drop the tank....

i just wanna drive it

t_g_farrell

iTrader: (1)

Is it getting a full 12 volts? Did you do the relay mod for the fuel pump?
It can make a huge difference.

Bobbo

iTrader: (4)

yes all 12... it is hooked to a switch and a fuse... no relay....

Bobbo

iTrader: (4)

after working with it this morning it seems like everything is good right up until it goes into the carb... if it is all hooked up it will hold 3 psi for about 45 seconds, then it loses the pressure..... if i unhook the fuel line right after the fpr it regains it's pressure.... hook it back up, stays good then loses pressure once again after about 45 sec......

any idea's?

Bobbo

iTrader: (4)

i don't know if it makes a difference but the fpr isn't the right one, it's too high pressure.... soooo im getting the low pressure fpr to see if it performs a little better.... i don't know if thats the issue or not, but i guess a good place to start.....

AnY helP WOUld be gGREat !!!!!!!!!!!!

mazdaspeedrex

I use a Holley FPR with mine and I've never had a problem. It sat for 6 years and when I dropped the new motor in it started up and worked fine. I'd double check the voltage and the inlet/outlet. If it stops at the carb check there also. Is the float sticking? Is the inlet clogged?

Bobbo

iTrader: (4)

my fpr is set for 4 1/2-9.... one part number off from the 1-4 psi regulator.... so i went ahead and got the proper one.... both of them look the same so it was an easy mistake i guess... still don't think that will fix it....... i blew all the lines out and checked the tank for debris.... nothing.... nothing is clogged, and i cant see the carb leaking anywhere..... i don't know if its the float or not... the car isn't flooding and it runs fine till it leans out from the pump only pushin' 1 psi..... will the carb effect the psi from the pump?

mazdaspeedrex

It shouldn't normally, but a restriction could cause a build up of pressure. I don't know of anyway for it to cause a drop in pressure

Bobbo

iTrader: (4)

ok i got the new regulator and now it appears that the fuel pressure is good and steady once again...... NOOOOOOOW for the new issue.... i have a DHLA 48 on a supposed fresh rebuild...the car will idle at a steady 800, but between 1kand 4k it has a horrible time running, it needs to be feathered up to whatever rpm, but it will stay at a constant rpm... for example.... to get to 2k, i have to feather it and apply very little fuel, but once i get it to 2k, i can keep it there easily..... Once i get passed 4k it runs great again... any ideas on this?!??!?!?!?!!?!?!?!?!?!!?!?

Bobbo

iTrader: (4)

made another post for the carb issue.... now the pump is doing the same thing all over again... it pumps as soon as i pull the fuel line off the carb, but about 45 seconds after hooking it back up the pump gets quiet and stops pushing.....

i pulled the tank and checked it for rust.... nothing.... while i have the tank out im gonna check the vent for the tank, and see if i pour the fuel into the fuel line (so the pump doesn't have to pull at all) if that does anything.....


any suggestions would be great!!!!!

19-r-e-d-79

iTrader: (1)

just a quick thought . the Holley Blue pump is a 14 psi pump. using the fpr to drop it to 3 pr 4 psi is going to put a strain on the pump as it is pumping 14psi all the time. a good way to check is to run the pump with the fpr into a bucket .
ps what carb are you only running 3psi too .

Bobbo

iTrader: (4)

carb is a dellorto 48.... i have the holley for future upgrades (i'll need the volume it pushes)

i tried it in a bucket and it worked great.... the only time it doesn't work is when it is completely plumbed, but when you break the line anywhere in the system the pump starts working well again....

this morning i connected a large funnel up to the end of the fuel line where it connects to the sending unit and filled with gas.... started the pump and it worked fine..... started the car and it actually ran the best it has yet.... probably because the pump held steady pressure and the idle mixture on the carb was set better.....

i guess holley pump (as loud as they are) don't like to draw a syphon from the tank... it just needs to be fed... i think i am just gonna weld in a sump and some fuel lines out of the bottom of the tank and see how that goes...

19-r-e-d-79

iTrader: (1)

i run a holley blue with a Holley fpr and have no problems running my racing beat holley kit at 7.25 psi . are you running a return to the tank ? i was once told dellordo's need a return . i would run one anyway just because you have that extra psi building up . you can also try and put a tee in the line before the fpr and run it into a bucket . i am willing to bet you will have no issues then as you will not be building up the extra psi.

Bobbo

iTrader: (4)

it's set-up to dead head into the carb... racing beat doesn't have it returning so i imagine there is some other explanation here..... i replaced the stock vent with a roll valve and a couple loops of fuel line to keep the lines from leaking any sloshy fuel.... hopefully this and the outlets being welded in the bottom of the tank will help me..... i feel like this is excessive and probably won't help my issue much, but idk... i need to get the welding skills back up anyway