Fuel Pump Noise

[Fernando87mj]

It's was a really hot day here In Vegas today ,and I noticed that I could hear my fuel pump run from inside the cab once the truck was running after a while , but the noise isnt as loud when cold. my question is , is it Normal or should I be worried ?

Also it's a 1987 4.0 5speed and the engine was running at 200~210*

[JeepcoMJ]

[ftpiercecracker1]

Do you still have the ballast resistor in place?

[Strokermjcomanche]

87 didn't have the resistor . It started in 88 . There noisy, but how noisy ? I've heard mine for as long as it's been in the truck (5 years ?) but it functions well

[Bobolink]

I can hear mine in my '90, and I'm damned near deaf. But I only hear it sitting still at idle, just a soft hum-m-m.....any movement and road noise drowns it out. I can also hear it from outside the truck when I walk past the gas tank on my way to close my gate. Been like that as long as I can remember, and never missed a beat during that time. 

[ftpiercecracker1]

87 didn't have the resistor . It started in 88 . There noisy, but how noisy ? I've heard mine for as long as it's been in the truck (5 years ?) but it functions well

 

oops  :oops:

[Strokermjcomanche]

No worries ftpierce . I had to learn that also .

[JeepcoMJ]

All 5 of the 87s I have owned have had c101 and resistors.

[Strokermjcomanche]

The 87s I owned didn't . As cruiser posted it could be retrofitted with one if some one complained about the pump being loud.

[JeepcoMJ]

As that is the case, it would be advisable to amend the statement that all 87s "shouldn't" have one. Blanket statements can be confusing to a novice.

[Strokermjcomanche]

You're implying they all have them ?

[JeepcoMJ]

That you can't expect them to have them or not. It seems to be a variable thing.

[Fernando87mj]

Mines doesn't have it ,

But my 88 does have the ballest resistor

[cruiser54]

That you can't expect them to have them or not. It seems to be a variable thing.

Correct.