No power to fuel pump

JBRACHMAN

MEMBER
1990 FORD E-SERIES VAN
6 CYL
2WD
AUTOMATIC
266 MILES

I have a 1990 E350. 4.9L Inline 6cyl. Just overhauled. Not getting any power to fuel pump. I'm getting 12 volts into the relay, but little to nothing out. I can jump the relay & the fuel pump kicks on. (Inertia switch & relay are fine)Could this be a PCM problem? Or could there be a fusible link somewhere? It seemed to work intermittantly for a short bit. I did have a stuck solenoid, so when I tried to reconnect the battery, there was some "excitement."

5 Replies

HMAC300

MECHANIC
48,601 POSTS

It still may be your inertia switch. Press teh white button on the floorboard to left and above where steering column passes through the floorboard. Also your relay for the fuel pump is the RB relay and #18 is the fuse for it.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Sunday, December 5th, 2010 AT 12:10 AM

JBRACHMAN

MEMBER
6 POSTS

Not it. I've bypassed the inertia switch. I can jump the relay from the hot wire in - to the power line to the inertia switch & the pump kicks on.

Was this

answer

helpful?

Yes

No

Sunday, December 5th, 2010 AT 1:19 AM

HMAC300

MECHANIC
48,601 POSTS

See if you have power to the yellow wire going to the fuel pump relay. If you don't then there is a blue wire running off the starter relay that is a fusible link. That is probably burnt up or not giving power to the yellow wire that its connected to.

Was this

answer

helpful?

Yes

No

+1

Sunday, December 5th, 2010 AT 1:35 AM

JBRACHMAN

MEMBER
6 POSTS

There is power to the yellow wire. PCM the only other culprit?

Was this

answer

helpful?

Yes

No

Sunday, December 5th, 2010 AT 6:25 PM

HMAC300

MECHANIC
48,601 POSTS

If you have power then it can be a bad connection to the pcm. Idoubt it's the pcm, but could be. I'd check the connection first as it could be a broken wire someplace.