fuel pump question from a newby
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Joined: Aug 2007
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From: ephrata pa
fuel pump question from a newby
Hi,this is my first post.I have a 91 f150 with the 5.8 liter v-8. It has dual tanks.Does this truck have 2 fuel pumps(one for each tank?) or only one?I had my truck on the rear tank and it really sucked down the gas and I had no power at all.I had to take the overdrive off just to reach 65mph.As soon as I put it on the front tank I had my power back.I also heard a banging noise from under the truck.I have no idea what that was,I thought it was the tranny.If this sounds like a fuel pump problem what model pump would this be?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by pamudder883
what is a fdm?
Originally Posted by pamudder883
And if I switch my tank to the front & I have power, why would the front pump be bad?
The front pump would work OK because the check valve would be open anyway while it is pumping. Normal operation.
Originally Posted by pamudder883
How could I tell if the check valve is bad?
Note the Fuel Pressure Regulator (FPR) can let the pressure drop fast if it is stuck open or has a ruptured diaphragm but you say it runs OK on the front tank so we will guess that FPR is OK.
Last edited by subford; Aug 19, 2007 at 01:57 PM.
