I just installed a Walbro 255 in-tank pump. Since the install Ive noticed something. When the truck sits for a while, like overnight, It takes 2-3 extra revolutions before it starts. After the initial start it will start on the touch of the key all day. I am pretty sure I did a good job on making sure my hose connections on the pump were tight, I even pressure tested it prior to install.

Is this normal? Im thinking maybe because I had to cut the fuel bucket to retrofit the high vol pump??

Should I have to get my PCM reprogrammed after changing to a high volume pump?

I just ordered a FP gauge just to rule out my regulator having problems, although I never had this problem with the stock fuel pump.

 

How difficult was it to change the fuel pump? Any pointers or trouble areas. Hope to change mine out in the near future. Sorry I have no answers for the extra start up time.

 

Ive always been told to turn the key to the acc on position to prime the fuel system first. Sounds like when it sits overnight the fuel in the lines leaks back so it takes a few revolutions for the pump to get fuel back in the lines.

 

There is a check valve in the sending unit that holds fuel in the line so that it wont bleed down over a period of time. something might have gotten disturbed when you switched it out. Ive never seen it to be a problem, just customer saying that it takes a while to crank after it sits. Unless you want to fix it , id say just turn the key a few times to get it primed up in the morning.

 

The check valve on the pump it self?

 

Ummmmm now that you ask ill look and see if I can find where it is exactly. What year truck is it for?

 

I looked up some info and I think that it is built into the pump but im not 100% sure. Pull the hose off the fuel psi regulator and make sure there isnt any fuel in the line. All we do here at work is replace the fuel sender for this problem since the pump is built into the sender for us.

 

I hear about people having that problem all the time with the walbros on F-bodys. It is jus one of those things that you have to learn to live with. It isn't going to hurt anything.

Aaron