guys i did some serious fuel pump testing this weekend-----i measured the amperage/wattage of a stock low mileage 87 pump and a new 340 at several voltages and pressures------i will post the data tomorrow when i can stop by the shop and get a disc of the data-----while i had the equipment set up i also did quite a few tests of popular fuel pumps-----i did pressure vs flow vs voltage and have both charts and graphs of the data-----from the general lack of good data i felt a lot of you guys would find it useful and interesting-----here's what i tested and why and how i did it in case anyone has any comments or questions-----to answer the question about the low voltage issue i did the following test------i took a dyno stand mounted GN engine with stock fuel rail and regulator and measured the rail pressure vs voltage vs amperage-------here is what it was measured with------powersupply was a Raytheon DCR 40-40B with remote sensing regulation feedback that guarantees terminal voltage of the test item to .01% accuracy reguardless of wire and connector voltage drops-----voltage was measured with an Audio Precision System Two with DCX-127 option that displays voltage to 5 decimal places with .00005% accuracy------current was also measured on the DCX with a Snap-on EETA 308-A low current probe-----while this device is not of the same class as the rest of the equipment used in the test we carefully calibrated it before each test with a Hewlett Packard 6902B amperage calibrator before each series of tests so the accuracy could be considered good to two decimal places-------pressure was measured with a Snap on Modis with the EEPV 302 AL pressure transducer with accuracy to .1%-------I do all my fuel related flow tests with actual "regular shell 87 octane gasoline" to eliminate the need for correction factors needed with test fluids-------the entire data will be posted tomorrow but for a brief here are some numbers--------stock pump @ 60PSI -- 9 volts --6.51 amps = 58.59 watts--------18 volts --9.10 amps = 163.8 watts -------walbro 340 @ 60 PSI 9 volts--7.78 amps = 70.02 watts-------18 volts---10.01 amps = 180.18 watts---------the charts will show all the data in one volt increments from 9V to 18V for 40, 50 and 60 PSI---------i also did complete fuel pressure curves for the following pumps-------two 86 stock pumps picked at random from a crate of about a jillion as well as a pair of 87 stock pumps from the same pile--------i tested several walbro pumps from what appears to be the three main groups-----from what i can tell there is the 242-250-278 series-----the 307-315-317 series and the 340-341-342 series ???????-------at any rate i tested a 242----a 307 and several 340's-------- flow tests on these used some of the previously mentioned equipment as well as a Dwyer model TF 1072 flowmeter and TM-2 totalizer------it reads in gallons per hour and is accurate to: 100 GPH 0.02%, 50 GPH 0.20%, 20 GPH 1.2%-----"it has been calibrated with Gasoline"-------stay tuned............RC
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View attachment 53241guys---------here are the first of the test charts----------these are the ones that graph voltage vs current vs pressure--------NOTICE that there are no FLOW numbers in this test-------the flow was whatever the pump did and whatever the regulator returned---------it clearly shows that low voltage does not increase electrical dissipation of the pump-------remember to get wattage (heating effect) we simply multiply volts X amps------i think this clearly demonstrates that low voltage is not a reason for pumps burning up-------not pumping fuel, yes-------but melting, no way---------i do have a weak but plausable theory--------notice on the walbro that the jump in current from 50 to 60 psi resulted in a much larger current increase than the jump from 40 to 50----------wish i had done a curve at 70 psi---------intuitively speaking i am sure that 70 would have shown some really big current numbers---------70 psi is not too far out of reality if your baseline is 45 ish and you run 25 lbs of boost-------are we running more boost overall these days than we used to????------i have a friend that runs 25 all the time with pump gas now that he has alcohol injection----------i doubt these relatively small pumps were ever intended to run at close to 15 amps for very long------combination of high turbo boost and volt boosters could be a recipe for problems????.....................RC
guys---------here are some flow numbers----------horizontal scale is pressure in PSI----vertical scale is flow in GPH-----tests are run at 12-13-14 and 15 volts-------------i'll probably break them up into several posts-----------starting with a pair of 86 and 87 pumps from good running low mileage cars---------good numbers for a baseline comparison to performance pumps----------under each graph is a chart with the numerical flow values------- all numbers were rounded off to the nearest gallon-----------86 pumps are engraved 2699 and 87 pumps are engraved 2661----------not any significant difference except for the electrical connectors.............RC
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guys-------here are a few walbro pump tests---------about the history of the pumps-------most of them are new stock from ATR--------about a year ago when they had the auction i bought most all the buick related items-------i literally came home with three trucks loaded to the brim--------in the midst there were several cases of walbro fuel pumps--------i have high confidence that they are "real" and not counterfeit but i cannot guarantee it-------please don't hesitate to ask questions of anything that you don't think is clear--------i realize that as with most mass produced items that there are variations even if it is an ISO certified facility-------without doing LOTS of similar tests and averaging the data i cannot guarantee that there will not be variations from the results that i am showing------i can guarantee the the numbers that i measured are extremely accurate subject to a 1 GPH rounding---at this time i cannot quantify what if any break-in or long term use has on pump performance-------first chart is a 242 series pump--------second is a 307 series-----third and fourth is a pair of 340 pumps-------fifth and sixth is a pair of reds pumps that appear to be 340's but have the numbers ground off so i can't really say what they are for sure------they do exhibit some really good numbers at high pressure compared to all the 340's i have measured--------one of them was used and the other was right out of the box----------anyone have any pumps that you would like to have measured i will be glad to do it for you OR if you are planning on stopping by my shop on the oct weekend of 17/18 for The GM Turbo 6 club event you are more than welcome to bring your pump and have it measured as you watch...............RC
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here's a straggler that wouldn't fit on the last post.....RC
Guys
I conducted a test of the autozone E3270 fuel pump that some have gave good reviews about in this thread. So myself and Richard Clark flow tested this pump earlier tonite. I was going into this test with a open mind but having my doubts on it really being a quality performance fuel pump.
We didn't test the the amp draw on this pump for the fact of the pump didn't flow well enuff int he first test session to warrant anymore testing of it.
@ 12 volts of regulated power.
30psi--34GPH 40psi--28.5GPH 50psi--23GPH 60psi--16GPH 70psi--4.5GPH
@ 13 volts of regulated power
30psi--40GPH 40psi--36GPH 50psi--28GPH 60psi--22GPH 70psi--13GPH
@ 14 volts of regulated power
30psi--44GPH 40psi--39GPH 50psi--33GPH 60psi--28GPH 70psi--20.5
@ 15 volts of regulated power for those with a volt booster
30psi--48GPH 40psi--42GPH 50psi--38GPH 60psi--32.5GPH 70psi--23.5
None of the tests could we mantain a solid 80psi of pressure due to the pressure relief valve in the pump bypassing the fuel.
This pump was purchased this evening @ our local autozone here in burlington nc again part # E-3270 list price was 90bucks if someone wants it they can have it for 70bucks plus shipping
it has a total of maybe 10 minutes of run time.
pat broughton