Fuel Pump Drama

287 Views 6 Replies 7 Participants Last post by J!m, 8 d ago

Grover

Discussion Starter · 10 d ago

Ok, I’m stoked to take drive in D90 this morning, it died upon startup. Fired it up again and did not hear the fuel pump kick on to prime the system. I pulled the FP fuse, not the FP relay, and it fired up!
As I pulled out of my garage, it died. Pulled the FP fuse again, reinserted the fuse, it started ( could hear the FP kick on) then died. Again I pulled the FP fuse, reinserted the same fuse (it was not blown, it was good), I fired up and I pulled into my garage...went on with my day.
Two hours later, I started it and I fired up 10 times with no issue ( in my garage)...good times; however, I don’t trust it now...

Another note, this same thing happened about 2 years ago and it hasn’t acted up since...until now...

This is a stock 1995 NAS D90 with 103k miles.
It’s a weekend toy, not driven daily; however, it in excellent condition mechanically other than this fuel issue.
The fuel pump in original...I haven’t check fuel pressure yet, it on my list. Should I just bite the bullet and replace the fuel pump? Go figure, it’s got a full tank of gas too...

like to know y’all’s thoughts...

Save

1 - 7 of 7 Posts

LRNAD90

· #2 · 9 d ago (Edited)

I'd start with replacing the relay..

HELP - Engine Died While Driving..

So it was a nice afternoon yesterday, so I pulled the Defender out to go pick my daughter up from school. I didn't make it far though (maybe a mile from the house) when the engine died while driving. I was able to drift into a condo complex parking lot, and use the started to 'walk' her into a...

www.defendersource.com

Silver Relays - What am I missing?

Okay, so the truck doesn't start... Tested the silver relays, one appears to work, the other no.. It appears the OEM silver relay has a diode on the 86 terminal to the coil, requiring power to be applied POS to the 86 Terminal, and GND to the 85 terminal (See diagram from relay case attached)...

www.defendersource.com

Save

d901560

· #3 · 9 d ago

LRNAD90 said:
I start with replacing the relay..

HELP - Engine Died While Driving..

So it was a nice afternoon yesterday, so I pulled the Defender out to go pick my daughter up from school. I didn't make it far though (maybe a mile from the house) when the engine died while driving. I was able to drift into a condo complex parking lot, and use the started to 'walk' her into a...

www.defendersource.com

Silver Relays - What am I missing?

Okay, so the truck doesn't start... Tested the silver relays, one appears to work, the other no.. It appears the OEM silver relay has a diode on the 86 terminal to the coil, requiring power to be applied POS to the 86 Terminal, and GND to the 85 terminal (See diagram from relay case attached)...

www.defendersource.com

I keep 2 spares in the truck at all times. Years ago when I first bought the truck I mistakenly dropped the fuel tank and replaced the fuel pump when I couldn't hear it turn on. After all that work it still wouldn't start. I replaced the relay and it fired right up. It was a great lesson to teach me to start with the cheap / easy fixes first.

Save

jperakis

· #4 · 8 d ago

d901560 said:
I keep 2 spares in the truck at all times. Years ago when I first bought the truck I mistakenly dropped the fuel tank and replaced the fuel pump when I couldn't hear it turn on. After all that work it still wouldn't start. I replaced the relay and it fired right up. It was a great lesson to teach me to start with the cheap / easy fixes first.

at least you have/had a new fuel pump installed : )

Save

mgb2

· #5 · 8 d ago

d901560 said:
It was a great lesson to teach me to start with the cheap / easy fixes first.

And a reminder to stop and think before throwing parts at it. It's easy to jump to a conclusion (especially if the symptoms are those of a common failure) and not perform some simple diagnostics. A few minutes with a voltmeter and wiring diagram would identify the fault.

Save

Reactions: 1

uc4me

· #6 · 8 d ago (Edited)

mgb2 said:
And a reminder to stop and think before throwing parts at it. It's easy to jump to a conclusion (especially if the symptoms are those of a common failure) and not perform some simple diagnostics. A few minutes with a voltmeter and wiring diagram would identify the fault.

To add to this I'd also check the connections at the box to that fuse. Maybe a pushed in terminal not always making contact. Odd that fiddling with it allows the truck to start up only to die shortly after again.

After that I'd work backwards from the pump. I just traced a very long standing intermittent pump issue this way with my wire diagram, LR Workshop connector locator, meter and test lamp. My methodology paid off..followed it up to faulty harness connector in engine bay RH corner.

Save

J!m

· #7 · 8 d ago

Check for corroded contacts everywhere too... I put silicone dielectric grease on EVERYTHING now.

Save

1 - 7 of 7 Posts

Top Contributors this Month