Fuel Pump Bench Test

Reply Subscribe

Thread Tools

Search this Thread

Dec 22, 2008 | 08:46 AM

kxbronco

Thread Starter

Junior User

Joined: Dec 2004

Posts: 58

Likes: 0

Fuel Pump Bench Test

I'm trying to test the fuel pump from my front tank (87 F150 4.9l 4x4). I connected it straight to the battery and it made a little screeching sound for less than a second and then stopped. Can't get it to make another sound.

Shouldn't it run continuously? Does that fact that it doesn't run continuously mean it is bad?

TIA

Chris

Dec 22, 2008 | 08:52 AM

clerk

Junior User

Joined: Nov 2001

Posts: 93

Likes: 0

From: Grove City, PA USA

It may signify that it doesn't work, but be careful the pump motors are cooled by the liquid in the tank. running one dry can cause problems.

Dec 22, 2008 | 09:01 AM

kxbronco

Thread Starter

Junior User

Joined: Dec 2004

Posts: 58

Likes: 0

thanks for the quick reply Clerk. Just trying to confirm whether or not the pump is bad. Was only going to run it far a few seconds, but it only made a quick little screeching noise.

Dec 22, 2008 | 10:36 AM

Liemavick

Senior User

Joined: Jun 2007

Posts: 159

Likes: 0

From: Hallandale Beach

FYI I just replaced my fuel pump. I basically tested my old one by plugging it into the wire harness and it hummed for a few secs, I reinstalled it thinking it was fine. Once I did that the truck still wouldnt start. I pulled the fuel line after the fuel filter and tested again, no gas flowed! The pump was bad even though it "sounded" like it worked ;-)

Dec 22, 2008 | 10:48 AM

quicklook2

Post Fiend

Joined: May 2004

Posts: 11,289

Likes: 6

From: Lakewood, Ohio

he has a different type of pump.

his is the low pressure pump that also uses the frame mounted high pressure pump.

it sound like the pump is bad.

good idea to check the high pressure pump also.

all these pumps are cooled by the liquid going through them.

Dec 23, 2008 | 02:21 PM

kxbronco

Thread Starter

Junior User

Joined: Dec 2004

Posts: 58

Likes: 0

Thanks for the info guys. I took the pump out of the rear tank and it ran like crazy when I hooked it up to power, so I bought a new Carter pump to put back in the front tank tonight.

Dec 23, 2008 | 04:36 PM

court1100f

Elder User

Joined: Jun 2007

Posts: 759

Likes: 0

From: Humble,Tx

ok this is partially on topic ok A. my fuel pumps are bad all three the pressure pump and both intank sending units. B. prior to their demise I had the dreaded crossflow problem. c. since the 87s been sitting since 02 will I have to also replace the fuel injectors. and the question thats partially on topic is if I replaced all 3 pumps would it resolve the tank cross flow problem???