Need some answers here people.. I have a Walbro 255 HP fuel pump in my Crx. After a while of driving the car, it starts to make a squirming noise as if the car is low on gas and about to die. I was told from a few people that the pump was going bad. I then purchased a new Walbro 255 HP and installed it. It took a little while longer to do it but it is doing the same thing. The pump is sitting correctly in the tank and it makes this noise even on a full tank of gas. The louder the noise get's, the more it affects the performance of the car. I dont know what else do to. The old pump worked fine, took me on 2 out of town trips, and now im upset that I threw it away and there was obviously nothing wrong with it. Can anyone help me here?

 

I'd try a new fuel filter, blow out the fuel lines, made sure you're getting fuel to the injectors, etc.

Or, it could be spark. Try a known good dizzy, if you still get the "noise", then you know it's fuel related.

 

Is the "squirming noise" comming from the fuel pump?
Have you checked the fuel pressure?

As mentioned, was the fuel filter changed? 94

 

It has an inline Fuel filter.. Summit. And it's fine & fuel is getting the the car. The spark is also fine. There is no distributor on the car?
The squirming noise is indeed coming from the fuel pump. The fuel pressure remains constant. But if after a while when the car begins to act up, you see the fuel pressure dive when it starts to trip..

 

if the old pump worked fine then i would check the clamps from pump to the sending unit. or the wiring. what engine do you have if it does not have a distrubutor

 

The problem that I am having is not related to any spark or anything in the engine bay....

 

check over all the wiring and make sure you dont have a loose or corroded connection. Use a multimeter, not the stare at it and jiggle method,lol

 

Thanks. I will try that when I have a chance. Just curious as to if that would that cause an intermittent connection or a consistent but weak connection?

Anyone have any additional theories or assistance?

 

loose and especially corroded connections can cause all sorts of different sypmtoms.

I just had a ford focus today that had a very irregular and inconsitant misfire. finally traced it down to a correded wire inside the insulation for the trigger wire that went to the coil. It was raining like hell all day today and I even jiggled the hell out of that wire suspecting thats where it was coming from and it didnt change a thing.It just came and went as it wanted to. It was only after I started ohming it out from the ecu that I narrowed it down

 

This is the problem I'm having right now. Listen closely.

Now when you hear that squirming noise, the car breaks up and the fuel psi drops at high rpm.

 

Fuel pumps need to be submerged in fuel for them to operate correctly. The fuel cools and lubricates the fuel pump motor. The squirming sound is probably the brushes inside the motor starting to fail from no lubrication...

***BE CAREFUL running a fuel pump that has been submerged in fuel. Not that its outside the tank and exposed to oxygen, sparks inside the pump motor can IGNITE!!!***

 

The squirming sound still surfaces even on a full tank.

 

If you have a voltmeter, back probe the fuel pump connector and make sure you dont have a voltage syupply problem.
The Walbros are definately louder than stock, but to me that pump is questionable. Its basically an electric motor. You might have armature shaft bearings going bad. The fuel keeps the pump motor cool and lubricated.Running it that long could have possibly damaged it...Im sure youve heard electric motors go bad before.
Whats the voltage at the pump when it acts up?
Good luck!