hello first time here,need fuel pump help

[national]

82 Delorean the fuel pump has been buzzing so I was gonna replace it,looks like im needing the pump,both rubber pieces(the cover & the piece the pump sits in) & hoses,my hoses are braided & screw on,most places show regular fuel hose just clamped on but when the line is unscrewed off, its a bevel lip,not sure hose will go over it,also several options,do I just change the pump or new total assembly,where did everyone get their pumps at?

[Tamir A.]

Hi,

Welcome to the forum. Try searching in the upper right corner for FUEL PUMP. You'll see a bunch of threads. Here is a link to one of them:

http://dmctalk.org/showthread.php?12686-Fuel-sending-unit&highlight=fuel+pump+replacement

And try www.delorean.com for parts.

T.


82 Delorean the fuel pump has been buzzing so I was gonna replace it,looks like im needing the pump,both rubber pieces(the cover & the piece the pump sits in) & hoses,my hoses are braided & screw on,most places show regular fuel hose just clamped on but when the line is unscrewed off, its a bevel lip,not sure hose will go over it,also several options,do I just change the pump or new total assembly,where did everyone get their pumps at?

[Chris 16409]

The original fuel pump/tank hoses were plastic/nylon core that was shrink treated to a barb fitting. The inner core was covered by a woven mesh with a rubber outer covering. Over time, the rubber rots off and the woven mesh is exposed. Eventually, the inner core can become comprised and can leak from the barbed fitting. The common practice is to simply cut the rotted hose off and leave the barbed fitting alone. You can then secure modern high pressure fuel injection hose to the barb with a fuel hose clamp. As for your pump, converting to a modern all in one unit is the common practice. DMCH has a nice but pricey solution. An alternative is to use a GM pump from a Chevy Suburban circa 2003. This is what one vendor supplies. For $150 you get everything you need from Special-T-Auto. You can try sourcing the pump elsewhere, but you wont get the seal you need for the pump. If your fuel sender works, there is no need to have the sender built into the pump.

[Horsebox]

I replaced everything in the tank with the DMCH Combo and have been very pleased with it, although it's expensive. No more fuel leaks when refilling, no more nightmare trying to get the sending unit cap to screw on correctly, and modern-car fuel level gauge accuracy with working fuel light.

Just do two things: empty and clean the tank out if you haven't already and secondly trace all the wiring/connectors backwards from the pump to make sure you get a good solid "+12V" at the pump.

Have fun!


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[Jonathan]

Welcome!

Where abouts are you located National?

Reason I ask is our pumps can get noisy in warm weather when you combine that with running the car for a decent length of time.

The fuel lines are routed close to the coolant lines and over time, the fuel in the tank can get warm/hot. Not hot enough for a fire hazard though, but warm enough that you can find your pick-up hose going into the suction side of the pump collapsing somewhat. Then it tries to pull the fuel in through the equivalent of a collapsed straw in a glass of lemonade.

It can get better/worse if the orientation of the pump in that opening it is mounted in has it turned a little too far to one side and then underneath, that pick-up line is pushed up against the inside of the tank (some strange, curved shapes our tanks have).

Just something else that could be happening that you can check out before replacing any parts.

[Bitsyncmaster]

Fuel pump buzz was a very common problem when it's hot outside. I think it's due to cavitation in the pump because it still occurs if you do the spring in the pickup hose trick.

I have not heard of any buzz with the new DMCH pump/sender unit so It seems to be the best bet for curing fuel pump buzz.

[national]

Thanks everyone...I am located in nashville,tn..it was in the spring when the pump was making noise ,I went for a drive & barely made it back home.
Chris...you are exactly right on the hoses,the covering is coming off of them,look terrible,have you or anyone ran the $150 pump assembly? Looks like the best way to go,hate to mess with originality but that looks best
Welcome!

Where abouts are you located National?

Reason I ask is our pumps can get noisy in warm weather when you combine that with running the car for a decent length of time.

The fuel lines are routed close to the coolant lines and over time, the fuel in the tank can get warm/hot. Not hot enough for a fire hazard though, but warm enough that you can find your pick-up hose going into the suction side of the pump collapsing somewhat. Then it tries to pull the fuel in through the equivalent of a collapsed straw in a glass of lemonade.

It can get better/worse if the orientation of the pump in that opening it is mounted in has it turned a little too far to one side and then underneath, that pick-up line is pushed up against the inside of the tank (some strange, curved shapes our tanks have).

Just something else that could be happening that you can check out before replacing any parts.

[Jonathan]

Thanks everyone...I am located in nashville,tn..it was in the spring when the pump was making noise ,I went for a drive & barely made it back home.

No problem! There are a number of knowledgeable Nashville area owners if you want to reach out and get some help or a second opinion.

May I ask what symptoms you saw your car doing the time you barely made it home? I mean other than the noise of course. Did the engine stall or did engine temperature climb or electrical voltage go down? Just curious.

Is your car original for the most part? Stock set-up that is. Still the PRV6? You have an auto trans or manual?

[DavidProehl]

have you or anyone ran the $150 pump assembly?

I think you mean $419 pump assembly (http://store.delorean.com/p-10569-fuel-pumpsender-module.aspx). I highly recommend it. I spent 7 years dealing each year with some type of fuel issue related to the stock fuel pump setup. I'm only about 4 months into having the new setup, but already like it way more than stock. It is hidden away so your car will still appear stock.

[David T]

I think you mean $419 pump assembly (http://store.delorean.com/p-10569-fuel-pumpsender-module.aspx). I highly recommend it. I spent 7 years dealing each year with some type of fuel issue related to the stock fuel pump setup. I'm only about 4 months into having the new setup, but already like it way more than stock. It is hidden away so your car will still appear stock.

There are vendors that can still get you the parts to stay original and it is a little less expensive. The main problem with the original set-up is the pick-up hose. It can collapse under heat and high vacuum. The tip is to put a spring in it from a screen door. You can get them at a hardware store. If you pump is making noise eventually it will fail, it needs the fuel to lubricate it and keep it cool. When it doesn't get it, it gets noisy and wears out prematurely.

[bfloyd]

National.... I'm literally 25 minutes right up the interstate from you in Lebanon. I replaced the fuel pump on my '81 earlier this year with the DMCH pump/sender combo unit and it works absolutely perfectly. It's truly play-n-play. If you get one and need help putting it in, shoot me a private message, and I'd be happy to help in any way I can.