I put a Walbro pump in my car about a week ago, and now after it has been sitting for a while, it is hard to start up. It didnt do this until I put the new pump in, anybody got any ideas?

 

Might want to put a fuel pressure gauge on it and confirm it is fuel related. It is possible that a botched install could lead to fuel delivery issues.

 

I put a gauge on it, after the car sits for about 20 minutes the gauge starts to drop. What do you mean botched install?

 

loss of pressure might mean the check valve

when i did my install i did the clamp to tight (the one that connects the rubber feed line to teh sending unit) and it screwed up the check valve, so i sent it back and got a new one (it might have been faulty but i blamed it on myself lol)
mine is a granatelli but they are very similar


may not be ur problem but just some insite on what could happen

 

I dont remember seeing a clamp there.

 

don't know how those pumps are made but i work on acura's and there pumps have internal check valves when that starting issue comes in we replace the pump and that fixes it

 

Yeah, it is a brand new pump.

 

Did you use the plastic line or replace it with rubber?

 

I used the supplied plastic line. The car didnt do it today.