Aftermarket Fuel Pump

[Inge K.]

Your OEM pump is also capable to make a similar high pressure, but FPR behind #4 TB brings down
the pressure to 36 psi....it will also do that to the Escort pump, or any other.

[kris]

Thank you, Inge. Makes complete sense.

[jenkinskg]

Got one at NAPA also, for a 91 Jeep Wrangler 2.4 l, has screw terminals perfect for my 92 tank that had loop connectors
Put a piece of radiator hose around it, then it fit snugly into tank.

Works awsome , no issues at all

[caseyvr6]

I realize this is a very old post, but since I found it through a google search I though it was a good idea to update. I found this pump, can't beat the price. Free shipping, and it's OEM size/spec so I was pretty happy about the find. Update to confirm functionality...

http://www.highflowfuel.com/i-23899630-new-intank-efi-fuel-pump-bmw-k75-k75c-k75rt-k75s-1984-1996.html

Pair this up with the NAPA 3032 fuel filter, which is about $4 instead of the $35 dealer filter, and it's a great service for a price my wife won't give me the "we have all these projects and you spent what?" conversation for...

[Laitch]

Useful post, caseyvr6, although the avatar is not particularly confidence inspiring. :hehehe

[TX brick]

I realize this is a very old post, but since I found it through a google search I though it was a good idea to update. I found this pump, works great and can't beat the price. Free shipping, and it's OEM size/spec so I was pretty happy about the find.

http://www.highflowfuel.com/i-23899630-new-intank-efi-fuel-pump-bmw-k75-k75c-k75rt-k75s-1984-1996.html

Pair this up with the NAPA 3032 fuel filter, which is about $4 instead of the $35 dealer filter, and it's a great service for a price my wife won't give me the "we have all these projects and you spent what?" conversation for...

I think the pump size changed near the end of the production run(93?) so this pump may not fit the later years.

[Laitch]

I think the pump size changed near the end of the production run(93?) so this pump may not fit the later years.

As you have indicated, TX brick, it's wise to be certain that aftermarket parts will fit the intended application.

How I read caseyvr6's post is that he ordered one of those pumps, installed it in his 1995 K75 and is satisfied with how it works. Maybe he'll add a post to verify that.

[caseyvr6]

The short answer is that the pump was confirmed to fit by the manufacturer, but today when trying to install it was actually much too large (diameter/length) so it's headed back. This pump https://www.amazon.com/HFP-439B-Motorcycle-Intank-Fuel-Strainer/dp/B00T5MKPUE/ref=pd_day0_263_2?ie=UTF8&psc=1&refRID=KW1PEBB5W2WRP79B38XB looks like the correct pump, so the pump that originated the reply was incorrect. Now it'll be a test of Customer Service at Quantum Fuel Systems... will update

[caseyvr6]

New pump arrived (439B) which installed like a dream. highflowfuel.com was great about the exchange, the price was amazing, and comes with a guarantee. What more could anyone ask for? Now on to the injectors!!

[jenkinskg]

The NAPA pump I bought was to put in my tank from my last k75 which was a 94 k75s
So mine was later tank, I also did not have the plastic clip at all, used the radiator hose as mentioned

FYI

[caseyvr6]

So new pump was installed, with new NAPA filter, and seems to be pumping great (low noise, and with hose disconnected after filter fuel pours through line) but now I've got a new issue. The original issue, which was the coffin nail for the OE pump, was water in the tank. Now I think I have bad injectors from the same water, because the bike will start and run at idle but if I choke (even 1/2) or touch the throttle in the slightest the bike quits. I've tried the simplest tricks I can think of to get the water/gunk out of the injectors (dry gas, seafoam, injector cleaner) and let it idle for 30 minutes or so (I flushed the line with the cleaner by disconnecting the fuel line after the filter at the clamp on the hard line) but the issue is unimproved. I'm going to try to turn the injectors while attached to the manifold out to see if all 3 are spraying, any other suggestions?  If I replace I'm going to go to the 415's or the 210's (http://www.ebay.com/itm/361500768184) for availability and cost more than the performance.

[stokester]

Put a piece of radiator hose around it, then it fit snugly into tank.

Any concerns with that hose immersed in ethanol-laced fuel?

[TX brick]

So new pump was installed, with new NAPA filter, and seems to be pumping great (low noise, and with hose disconnected after filter fuel pours through line) but now I've got a new issue. The original issue, which was the coffin nail for the OE pump, was water in the tank. Now I think I have bad injectors from the same water, because the bike will start and run at idle but if I choke (even 1/2) or touch the throttle in the slightest the bike quits. I've tried the simplest tricks I can think of to get the water/gunk out of the injectors (dry gas, seafoam, injector cleaner) and let it idle for 30 minutes or so (I flushed the line with the cleaner by disconnecting the fuel line after the filter at the clamp on the hard line) but the issue is unimproved. I'm going to try to turn the injectors while attached to the manifold out to see if all 3 are spraying, any other suggestions?  If I replace I'm going to go to the 415's or the 210's (http://www.ebay.com/itm/361500768184) for availability and cost more than the performance.

A bad airflow meter will also cause the RPM to not go above idle.

[caseyvr6]

Would this also cause a rough idle? Any suggestions on diagnostics? The reason I'm leaning on plugged/failed injectors is the water in the tank and the failed OE fuel pump.

[Laitch]

Would this also cause a rough idle?

The only things you seem to have described about your bike is that it's a 1995 K75 that has a new aftermarket fuel pump and a new fuel filter which were followed by an engine performance problem.

How long have you owned it? How many miles are on the bike? How many miles have you ridden it? What was the condition of the tank's interior when you installed the parts? What is its maintenance history? What other maintenance have you done to it?

[caseyvr6]

Is my blood type and favorite wine also required?  :neener:

The bike has miles on it, most of which were put there by myself or my father. He owned it since '99 and I purchased it from him about 8 years ago when he bough his K1200LT. The tank was shiny and clean, with minimal granular debris in the bottom which was cleaned out when the pump was replaced. The bike ran like new until this issue and has been maintained by myself on schedule.

The fuel pump had been whining for 2 seasons, at increasing decibels, and when the bike was left out in the rain by yours truly some water got into the tank because I was foolish enough to open the fuel fill cap while there was still water that had not drained from around the edges. I didn't know how much water had entered the tank, but had assumed somewhere near 1/4 cup of rainwater, so I added some fresh fuel and dry-gas and drove it. I made a 30 mile round trip when it started giving issues near home, with the fuel pump screaming at me from inside the tank. The bike would hardly maintain 30 mph and the throttle seemed more of a suggestion than a user interface. I  turned around 2 miles away and crawled home, took my truck to work that day. To this moment the repairs for this issue include a brand-new fuel pump and filter, fully drained fuel tank (removed from bike, inverted, rinsed with fresh fuel and debris cleaned with clean dry rags. With a new pump, filter, clean/clear non-ethanol gas, and the lines flushed with new fluel to the hard-line inside the tank (tomorrow it's going to be pull the line off at the back end of the injection manifold and flush the new fuel that far), there has been no improvement in the symptoms except that the pump is substantially quieter and the bike will at least idle as long as the choke does not go beyond about 35% (cannot go to mid-stop) and the throttle is not touched whatsoever.

I can hear what sounds like one of the injectors, possibly two, but with the bike running I am unable to isolate with much confidence. After flushing the line tomorrow I'm going to try to remove the injectors and turn them on the injection manifold away from the bike so that I can see the individual spray patterns. The easiest answer is that one or more will have a terrible pattern or none at all. Any further suggestions or diagnostic tips are appreciated.

I also enjoy non-fiction and vanilla soft-serve ice cream. :2thumbup:

[Laitch]

Is my blood type and favorite wine also required?
I also enjoy non-fiction and vanilla soft-serve ice cream.

Sunsets? What about sunsets and walks along the surf?

[Martin]

You shouldn't get water into the tank if you have the cap orientated the right way. The hinge goes to the back and there is a drain built into the cap to stop water entering if you open it while it is on the side stand. Could also be a blocked drain if the cap is on right.
Regards Martin.

[caseyvr6]

Sunsets WHILE walking... you get the point.

I forgot to mention the drain, because you're right it should have drained. The hinge is on the rider's side (toward the rear) and while doing the fuel tank cleaning, both when the tank was benched and when it was reattached, I blew out the drain with compressed air. I didn't find any noticeable blockage but I'm sure a tiny spiderweb could be sufficient and wouldn't make the spitball noise I was listening for. It's only occurring to me now that I probably should have started a new thread with the fuel issue instead of jacking the tail of an older, only semi-related thread. Will do so now with a copy of the "symptoms/solutions" post from last night.

[F14CRAZY]

You shouldn't get water into the tank if you have the cap orientated the right way. The hinge goes to the back and there is a drain built into the cap to stop water entering if you open it while it is on the side stand. Could also be a blocked drain if the cap is on right.
Regards Martin.

May want to replace the gasket that's in between the filler door assembly and the tank (dealer can order it). Water may be able to get into the tank that way

[caseyvr6]

The issue was when I opened the fuel door, the gasket kept the water out but couldn't make me smart enough to not open a door when underwater. I did, however, blow out the drain line to maybe help me be smarter, or count on my own stupidity.

[GT350Mike]

I think my fuel pump has died on my 92 K100 so before order a pump, I wanted to confirm which pump didn't fit your K75.   Was the pump from highflow.com larger than 52mm?  What was the diameter of the 439B?  Also, did you replace the fuel pump vibration damper?

[TX brick]

I think my fuel pump has died on my 92 K100 so before order a pump, I wanted to confirm which pump didn't fit your K75.   Was the pump from highflow.com larger than 52mm?  What was the diameter of the 439B?  Also, did you replace the fuel pump vibration damper?

I'm not sure if your bike has  the older large or newer small pump, but I would remove pump and power it directly to test it. There are two common connections where the pump can  lose power.

[GT350Mike]

I test the pump (52mm) and figure out the impeller was stuck so I took it apart and cleaned everything. Tonight I'll put it back together and test it again.

[stokester]

Any concerns with that hose immersed in ethanol-laced fuel?

Am I the only one who would be concerned with a radiator hose immersed in fuel?  I've seen how non-fuel rubber reacts to petroleum products.