High pressure fuel pump
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From: Dededo, Guam
High pressure fuel pump
Does anyone here know the max aperage draw of the high pressure fuel pump in a 90' f150 is. I am thinking around 30 amps. I am trying to find out because I want to wire in a power filter to cut out the noise it generates (not the audible noise, the noise picked up by my CB radio). Any information will be appreciated.
Post Fiend
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From: Memphis, TN
High pressure fuel pump
I'd be surprised if it pulled 5A, but is it really important? What kind of noise filter are you planning on using? A 12V capacitor from the pump power wire to ground will filter the power noise. If you're trying to filter RF, it doesn't even make it out of the motor's metal housing; much less thru the floorboards.
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From: Dededo, Guam
High pressure fuel pump
Wow 5 amps, i didn't know it was that low. Steve, my fuel pump radiates a good amount of RF, enough to be picked up by the CB. Ford sells a power filter for this kind of thing after people started complaining about noise picked up by their Cb / Ham radio sets. I am picking up the same noise. Its not alternator or ignition. Alternator would make a constant whine. Ignition makes a popping noise. The noise varies with how much i push the gas pedal which led me to believe its my fuel system. The part Ford sells is 60 bucks. I can get a power filter from radio shack for 10. I don't know enough about caps to figure out exactly what i need.
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From: Memphis, TN
High pressure fuel pump
charlez
Where'd you find 20A? All the FPs are on powered directly off a fusible link (no other overcurrent protection), but I've never found documentation on how much they're each rated for.
Where'd you find 20A? All the FPs are on powered directly off a fusible link (no other overcurrent protection), but I've never found documentation on how much they're each rated for.
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High pressure fuel pump
Steve83 is right, I use a low amp clamp to test electric fuel pumps for amperage and rpm, usually on any electric pump, they come in at 4-7 amps of draw, one that has a clogged fuel filter will draw 10-11, a burned out pump will draw 2-4,(slow running also). Acceleration whine is most likely the Alternator, namely the part inside called the rectifier assembly is bleeding AC across the rectifier. Unplug the Alternator and start it up, rev the engine as before, hear for the whine. A fuel pump is a constant rpm, flucuation in the whine is by rpm, (Alternator). Forget the power suppressor, repair the alternator. Hope this helps, Electric1
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From: Memphis, TN
High pressure fuel pump
I agree with Electric1 - if the whine varies with engine RPM, it's definitely NOT the FP, which runs at the same speed regardless of the engine (even if the engine is OFF). Your noise is almost certainly coming from the ignition (see if your radio interference capacitor is still attached to your coil) or from your alternator.
To prove it, just see how much noise you get by turning the key to RUN - the FP will cycle for about 1sec, and if you have interference in your CB at the EXACT same moment, you'll know you're right.
If you get no noise that way, unhook the alt with the engine running as E1 suggested and see if THAT stops the noise.
If you still have interference with the alt unhooked but the ignition is firing (engine running), then you'll know it's ignition noise.
To prove it, just see how much noise you get by turning the key to RUN - the FP will cycle for about 1sec, and if you have interference in your CB at the EXACT same moment, you'll know you're right.
If you get no noise that way, unhook the alt with the engine running as E1 suggested and see if THAT stops the noise.
If you still have interference with the alt unhooked but the ignition is firing (engine running), then you'll know it's ignition noise.
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From: Dededo, Guam
High pressure fuel pump
I did some tests, and the fuel pump is causing the noise. Key on to run, and the FP kicked on to pressurize the fuel rail. CB radio was on (directly wired to the battery). When the FP was on definite noise heard throught the CB. I did this several times all with the same results.
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Post Fiend
Joined: Jun 2002
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From: Atlanta GA
High pressure fuel pump
In regards to what "Electric1" said about amp draw, that is pretty much on the money. I used an expensive machine to test current draw on my BII and how much the fuel system used and it came in about <=10 amps.
Post Fiend
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From: Memphis, TN
High pressure fuel pump
jrs
Well, it's definitely a power-line problem; not RF. Sounds like the power supply inside the CB is going bad because it should be able to filter that little bit of 12V noise, but an external 12V capacitor across the CB's power wires will help. Any size (mF) will help, but putting several of various sizes will do best since they'll each tune to a specific frequency. You can probably get them by the pound at Radio Shack for a couple of bucks or less.
Well, it's definitely a power-line problem; not RF. Sounds like the power supply inside the CB is going bad because it should be able to filter that little bit of 12V noise, but an external 12V capacitor across the CB's power wires will help. Any size (mF) will help, but putting several of various sizes will do best since they'll each tune to a specific frequency. You can probably get them by the pound at Radio Shack for a couple of bucks or less.
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Posting Guru
Joined: Oct 2002
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From: Dededo, Guam
High pressure fuel pump
Hmmm, I don't think that the CB has a power problem, it it wired right to the battery. Ford sells a part specifically for this purpose. I amn just trying to save a couple bucks.
