Walbro external pump ?'s
Thread Starter
On The Tree
Joined: Aug 2009
Posts: 113
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From: Texas
Walbro external pump ?'s I have a walbro fuel pump ( model 393?) for my 2005 4.8l, converted it to a 02 intake and fuel rails etc. now, the truck runs but it seams to have little power, when I check the fuel pump it reads about 50psi at idle, the needle jumps around too, could this be a bad pump? I was told these engines need 55-62 PSI fuel pressure, help is very much appreciated.
Clyde65
Clyde65
On The Tree
Joined: Apr 2005
Posts: 126
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From: Colorado Springs, CO
That pump appears to be a lower pressure pump. I saw one site that rated it at 45psi, 155lph. It appears to be popular for a lot of 4cylinder turbo cars and stockish fordV8's wich use a lower pressure than the LS series chevy motors. You would be much better ff with the 392.
TECH Regular
Joined: Jan 2007
Posts: 411
Likes: 1
From: Louisville KY
There is something else wrong there. Need more information. Is it a 393? External or in-tank? Either way the 395 is the only pump that delivers less than 90 psi. At reasonalbe flow levels of course.
