Question about 1990 Ford F150

1 Answer

1990 F150 5.8 problem is,, no initial timer

1990 F150 5.8 problem is,, no initial timer switch igniting fuel pump relay and/ or fuel pump switch, we have gone thru everything, can the computer be causing the problem?? or any sugestions,, everything else works, was intermittant now wont work at all. Like I said we have done everything to find the proble, we are missing something small but hidden,,

Posted by on

  • 1 more comment 
  • gm_incllc Jul 15, 2009

    That was close, I found the problem, but it wasnt fusable links,, thanks No one could solve this, it was found by trial and error,, many times over

  • Mike Butler
    Mike Butler May 11, 2010

    I must have missed complete complaint/problem, can you please give a short description from start again?

  • Mike Butler
    Mike Butler May 11, 2010

    Checked all fusible links along fender from battery?



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 10 Answers

Did you check the fuel pump relay connector?, this connector tends to accumulate lot of rust that makes bad connections and can't get the right voltage for closing the switch and the pump won't start. also check the fuel shutt off switch and it's connection.

Posted on Jul 15, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Engine wont start

Engine does not crank (Does not start)
1. Starter and starter relay
2. Neutral start switch circuit
No initial combustion (Does not start)
1. ECM power source circuit
2. Ignition coil (w/ Igniter) circuit
3. Fuel pump control circuit
4. Fuel Injectors.
No complete combustion (Does not start)
1. Fuel pump control circuit
2. Ignition coil (w/ Igniter) circuit
3. Fuel Injectors.

Jul 30, 2013 | Toyota Corolla Cars & Trucks

1 Answer

Car turns over but wont start,checked altinator battery ignition switch distributor fuel filter dnt know what to do

First check for spark at any of the sparkplugs,if you have spark next check fuel pump fuse and relay then check fuel pressure.Turn ignition switch on and listen for pump it should come on for 2 seconds then shut off.

May 09, 2011 | 1990 Chevrolet C2500

1 Answer

Fuel pump, need a skiss how electric cables are placed in the ignition switch

The fuel pump draws far too much current to be allowed to go through the ignition switch. It would melt.
So there is always a relay.
And the ignition just turns the relay on and off.
The relay should be in the fuse box I would assume, but I don't remember exactly on a Saab.
As a temporary test, you can plug jumpers into the relay socket and run to a toggle switch.
But of course this is not a good permanent solution because you can forget and ruin the battery, or it could stay on in an accident.

May 22, 2010 | 1990 Saab 900 Hatchback

1 Answer

Turns over but won't start. fuel gauge stuck at

those are very good of loosing fuel pump relay .
And if you ck ignition components and they are ok , then ck fuel pump relay(main relay).

Apr 17, 2010 | 1990 Honda Accord

3 Answers

Fuel pumps wont shut off

Fuel pump relay contacts stuck? Aftermarket accessories tied into fuel pump relay circuits causing the relay to stay energized with the key off?

Oct 22, 2009 | 1990 Ford F150

1 Answer

New fuel relay and ignition switch now no spark

I had the same problem, I was the Igniter in the distributor, controls power to fuel pump and spark to plugs, I changed coil, fuel pump only to find out it was so simple, try changing the igniter in dist.
Good luck

Apr 30, 2009 | 1990 Honda Accord

1 Answer

1990 Lincoln TC fuel pump dead

from the ignition switch or the starter, power is taken fromeither of these points to fire the fuel pump on start. This is what charges the fuel system so that you can start. then your fuel pump goes into run mode.

If someone can make a power check on the wiring going to the fuel pump with the engine is being cranked, you can possibly solve your problem.

Nov 17, 2008 | 1989 Lincoln Town Car

1 Answer

Where's the switch?


To my knowledge, there is no separate switch to activate the fuel pump. The fuel pump is one of the many electrical devices powered by the ignition switch when turned on. This is necessary since the fuel pump must be active if and when the engine is running. Due to electrical design, that is to reduce current passing through the ignition switch, a relay is used to along with the ignition switch.

Often, this relay would be among the many relays in the fuse/relay box in the engine compartment pretty close to the battery. However, in your particular model and to my knowledge, it is under the dashboard. More particularly, the fuel pump relay is under and to the right of the glove box above the ECU. There would be two (2) other relays in that area and the fuel pump relay is the last almost hidden.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 24, 2008 | 1993 Toyota 4Runner

1 Answer

No power to fuel pump or to pump fuse at fuse block

You can get wiring diagrams from -- they have parts of repair manuals online. I have the smae problem but the person I got my 88 fox gl from wired up a switch going to the fuel pump that you have to leave on while driving. I"m probably giong to fix this soon. It looks like the wire powering the fuel pump relay comes from the ignition switch. So if the pump side of the relay is good, but aren't getting power, you may want to see if your ignition switch isn't providing power on one wire, going to the fuel pump relay.

Jun 24, 2008 | 1990 Volkswagen Fox

Not finding what you are looking for?
1990 Ford F150 Logo

Related Topics:

211 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

81285 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

gerry bissi

Level 3 Expert

4376 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides