mk so I replace the pickup sock on my fuel pump earlier today.

I cut fuel by turning off the pump and let the car kill itself to deprerssurize the lines.

the removed the pressure and return lines from the top of the fuel pump, let the remaining fuel drain from them and from the outlet on the pump, and then removed the pump.

I had a whole pump/filter setup a buddy gave me, so I installed that fist.

I put it all back together, reattatched the lines, and the connector to the fuel pump. I went and jumpered the yellow connector in the engine bay to prime the system.

I went and turned it over, it cranked for 5 or 6 seconds and fired up, but just barely.

it having a hard time holding idle and there is some hesitation in the throttle.

ive bled the fuel lines as best I could, it seems like its not getting enough fuel.

I uninstalled the different pump and putthe original one back in with the new sock. it does the same thing.

any ideas? it doesnt seem to have much of a bottom end at all, but seems fairly normal above 3000rpm

 

the one thing that really makes me think im lacking pressure is this:

I usually shut down witha fuel pump kill switch. I cut the pump and it will take 3 or 4 or 5 seocnds for the engine to sputter out.

right now, I cut the pump, and the engine dies. fast. like under 1 second fast

 

for future reference, if this thread is ever searched up...

make sure to check the connection between the pump itself, and the high pressure hard pipe. it is a pressure fit using an O ring and a rubber sleeve. I had pressure leaking from that junction, leading to the above results.

thanks to arron. I was reading through his n/a turbo write up on his site and came accross this photo:
(http://www.aaroncake.net/rx-7/pictures/naturbo/58.jpg)


by cutting off the flared part of the hardpipe and closing the gap with fuel line and 2 hose clamps, you can ensure a leak free connection!

if you ever remove youre fuel pump for any reason, and everpiernce running problems afterward, this would be a good thing to check!

-Jon

 

I'm not sure what you are saying here. The stock fuel pump has exactly the arrangement shown in the picture above. There's no o-ring. Nothing was modified in that picture except that I swapped the NA pump for an FD pump. It's a direct swap.

That's a really bad idea. The flare is very important to keep the hose sealed. It prevents the hose from sliding and gives the clamp something to tighten against. Also, regular hose clamps should not be used in a fuel injection application. Most auto parts stores sell fuel injection clamps that look like miniature T-bar clamps.

 

What is the safe method of cutting the flared section of the hardpipe?