Hot weather fuel pump is loud!

[drhill]

I decided to start another thread since this is a new issue. I have found that my brand new fuel pump starts out quiet but gets loud if I have been driving more than an hour or so in the heat. It's consistiently above 110 where I live right now. I also just filled the tank and noticed that as I drive it will leak gas out of the cap. I have to mention that right now I have the cap cracked open a bit because I have disconnected the tank vent line from the charcoal canister because that and the canister purge solenoid were not working properly. also, one it heats up and the pump starts making noise, I can feel the heat coming through the filler neck and if I put my hand there it will condense fuel on my hand!

This car sat for 10 years and I've brought it back from the dead. Is it possible the fuel filter I installed a month or two ago is already clogged and creating resistance for the pump? I cleaned the injectors, replaced the FPR and replaced fuel filter a couple months ago. I just replaced the pump a week or so ago just as a precaution. the previous pump was doing the same thing: making noise when it got hot after an hour or so of being on.

Maybe there is something I'm not thinking of?

[Tiggie]

Warmer stuff generally runs louder if it's quiet when it's cold. But I haven't experienced that with a fuel pump. With a full tank, do you still notice the noise? The fuel should keep the pump cool.

Check the fuel pressure to be sure the lines/filter/regulator aren't causing the issue. Maybe the return line is restricted?

On your charcoal canister disconnect, leaving it open *should* eliminate the need to crack the cap open. If it's building pressure with the cap tight, it's not disconnected correctly.

How close is your exhaust to the tank?

[gadget73]

If its building up pressure, thats not because the charcoal can is unhooked. Its probably the check valve up at the top of the tank. The vapors are supposed to flow out through that and get trapped in the charcoal, then get sucked out of the charcoal through the evap. if there is no evap eventually it just saturates the charcoal and vents to atmosphere but it should not be building pressure. That check valve up top gets gummy though. There is only a small hole in it to vent through and a ball in there to keep it from dumping fuel in a roll-over.

[drhill]

I don't know if it's a good enough test but I used a vacuum pump on the hose from tank vent to the wheel well where it connects to the hard line and it was clear. Could smell gas fumes when I was pulling vacuum as well. Also blew through the hose that connects the hard line to the charcoal canister and both the hose and hard line were clear. I'll check fuel pressure plus I have another fuel filter to put on in case the current one is clogged. I guess if fuel pressure is high i;ve got a return line or FPR issue, if it's low I've got a clogged pump sock or fuel filter....

That fuel gets super hot and the pump starts whining whether the cap is open or tight. It defintely pushes vapors through the vent line as I can smell them and it was much worse with the fuel cap on tight of course.

I just have stock single exhaust, I will make sure it hasn't shifted close to the tank or lines

[gadget73]

is it a significantly larger than stock volume pump? That will cause heat just because its choked off all the time.

[drhill]

is it a significantly larger than stock volume pump? That will cause heat just because its choked off all the time.

stock replacement pump, which goes against my nature but it's what I could get my hands on

[gadget73]

on a stock engine you don't need more. Was just thinking if this was some super duper upgrade pump working into the stock lines its basically being choked and working too hard as a result. That will make heat and noise.

sometimes the pumps are just crap and make noise.

[friskyfrankie]

I've found the Carters to be somewhat noisy as opposed to the OEMs. Of course, that was years ago so not knowing where the OEMs are now made makes it a "crap shoot"!

[drhill]

I replaced the fuel filter again yesterday and it was a little bit clogged up but I could still blow through it. Replaced a plastic line by the filter that had a slight kink in it. It's better but still get loud after a while. Only thing I didn't do when replacing the pump was clean the tank so could be some junk in the filter sock on the pump. I did feel around with a clean gloved hand and there wasn't any junk on the bottom of the tank so I'm hoping this isn't an issue. Aftermarket parts now are just junk. I just went through two brand new alternators on my wife's car and the parts store guys just shrugged when I would bring them back.

[gadget73]

I was poking through the records on my Mark VII the other day and there is something about the last owner replacing a fuel pump a short amount of time after it had been done initially. Note was OEM fuel pump installed, noisy Carter returned for refund.

so maybe they are just noisy. I've got an Airtex in the Towncar that I bought white-boxed from Jegs years ago, its not annoying. The Mark VII is apparently rocking an OE Ford unit. Those were Bosch.