dj55b

iTrader: (2)

Just curious to see if anyone has a spare one of these fuel pumps? I'm trying to trouble shoot an issue, I've changed a few things which have helped, but now I'm just curious if the pump is just going again. I have another one on order but it still won't be on till next weekend.

I would like to track it Wednesday and Sunday, so id like to make sure its not going to give me any issues for Sundays event. Wednesday is my test day for my new transmission and rear end.

JIMMY54

iTrader: (2)

If your having any fuel issues, I'd say to invest in a fuel pressure gauge (Inside the car) This has helped troubleshoot alot of issues on my car.

dj55b

iTrader: (2)

I have a fuel pressure gauge, not inside the car, but its been an issue that I've thought all year. I went through 3 walbros in one month, and now 2 Bosch in a period of 3 months.

I've changed relays, power wires, pre pump filter, and after pump filter, checked spring in regulator, kinks in hoses, the one piece of regular hose that was intank was replaced with all fittings to ensure pressure wasn't leaking out of there, we believe it might of been a combination of things, but after all these have been changed I think the pump has finally started giving out again. At over 200$, not the cheapest to replace neither.

Trots*88TII-AE*

iTrader: (11)

I'm surprised to hear that, they're usually solid pumps (the Bosch's) If you were closer I'd lend you mine.

thewird

iTrader: (8)

How's your tanks venting?

thewird

dj55b

iTrader: (2)

considering it has leaks, it should be fine, plus it has a vented cap now

FC3Sdrift

iTrader: (5)

do you have the vented cap because it has an inline pump? im just curious. i have no experience with those set ups

mine can make some pretty crazy pressure when i pop the cap sometime, its all sealed tight no leaks. I still have it venting to the charcoal canister. i just thought it was normal


if you check the pressure, voltage, and do a flow test into an empty gas can. a 255lph pump should flow 4.25L in a minute
you would atleast know for sure if it was the pump or some other gremlin

dj55b

iTrader: (2)

ya I tried sealing the whole tank up before the vented cap and it was creating way too much pressure. the pump is intank, not inline. there is no more charcoil canister, the original vent for it has rusted out internally or when I put the gas tank sealer in there, it might of gone up in that tube and sealed it up.

dj55b

iTrader: (2)

ill test it out when I get the new one in . the guys I bought these pumps from (jay racing) are purchasing a pump tester soon and will most likely get them to test it out also.

thewird

iTrader: (8)

Where did you get the vented gas cap?

thewird

dj55b

iTrader: (2)

part source, but with all the silicone removed it doesn't even matter as its all vented

TD07

Something in your setup is burning through pumps at an alarming rate. Given that fact I can't see anybody willing to let you borrow and burn up their pump as well.

dj55b

iTrader: (2)

like I said I think that it was a combination of things like I said previously, but it doesn't matter anymore ... I should have my new one in by tomorrow hopefully.

classicauto

iTrader: (3)

check that your return is flowing properly, no kinks or clogs. Also FWIW, I wouldn't really say you need an 044, or the high pressures you've tuned it for on that setup. I would partly suspect the high pressures being related to burning the pumps up.

If you were after an intank pump that flows well, I'd recommend a denso. I've been running mine for years - no issues and its mouse-quiet.

Nosferatu

Like the above poster notes.... Bosch 044 on a normally aspirated 12a, an "overkill" application for that pump. Unless you plan to run it at 75psi like the old K-jectronic CIS fuel injection systems it was designed for or a big boost turbo setup.

dj55b

iTrader: (2)

Well I run only 2 injectors currently and its the reason I'm running a higher pressure. With the pressure set at 60 psi on the 2x720cc injectors, at around 8krpm I'm a bit over 90% duty cycle. I do have another 2 injectors already plumbed in there now, but I tried to wire them up with the older firmware of the megasquirt with no good luck on getting the car running properly. I need to do the update first and then go on from there. But I don't understand how the first pump lasted me a bit over 2 years and now all of a sudden I'm having issues.

The only thing still not changed is that fuel pressure regulator, thats the last bit, but thats proving to be more expensive than the pumps.

Trots*88TII-AE*

iTrader: (11)

This might be a silly question, but can a pump fail from being over-worked due to the small total injector flow, since much more fuel has to be bypassed back to the tank at such a high pressure?

I would imagine it would be less strain on the pump if a larger percentage of the total fuel flow was injected, as opposed to being bypassed at the FPR. Whether that is enough for a pump to fail or not, I don't know. Probably not

dj55b

iTrader: (2)

They're normally designed to run like that, the more fuel that it circulates through itself the cooler its suppose to run the pump and the fuel.

If I'm not mistaken, that is why pumps fail if you have too small of a pump, its taking most of the fuel out of the lines and making the pump run hotter.