fuel pump problem again and again
Melting Slicks
Joined: Jul 2005
Posts: 2,649
Likes: 863
No...
If you are checking at the oil pressure switch, simply remove the electrical connector at the switch, and check current draw beteween pins "C" & "D" .
Or you could pull the fuel pump fuse and check current draw across the fuse terminals when the fuel pump is running.
If you are checking at the oil pressure switch, simply remove the electrical connector at the switch, and check current draw beteween pins "C" & "D" .
Or you could pull the fuel pump fuse and check current draw across the fuse terminals when the fuel pump is running.
Intermediate
Joined: Sep 2016
Posts: 46
Likes: 3
From: Carlisle PA
Would half of the load go thru relay.
No...
If you are checking at the oil pressure switch, simply remove the electrical connector at the switch, and check current draw beteween pins "C" & "D" .
Or you could pull the fuel pump fuse and check current draw across the fuse terminals when the fuel pump is running.
If you are checking at the oil pressure switch, simply remove the electrical connector at the switch, and check current draw beteween pins "C" & "D" .
Or you could pull the fuel pump fuse and check current draw across the fuse terminals when the fuel pump is running.
Does the fuse cover the relay supply and the oil switch supply?
6th Gear
Joined: Apr 2016
Posts: 6
Likes: 0
1990 C4 fuel pump
1990 Corvette L98 just turned 55,000 in 2018
2017 replaced sender( it would LIE) so put new fuel pump in,as precaution, also. Ordered KEMSO Fuel Systems,10912, Hi-Perf!. Pump said 340 LPH @ 43 psi ($29.95 total)(they compared with WALBRO 255). Says made in Japan, name registered to Chinese man., !?unk?! No markings on pump of country
They say direct OEM direct fit. NOT! splice wires and refit in sender
Did not check fuel pressure on install. It ran, I was happy! Developed running issues, rough idle low RPM surge.( NEW PUMP.! what could it be?) New fuel filter, new gas. vacuum tests, so on. (siphoned tank, CLEAN & CLEAR) FPR vacuum on or off, no change. (Total tune-up, wires , plugs, dist internals, etc, )
Fast Forward 2018 running issues worsened. Put pressure gauge. Tested repeatedly. Sitting and driving. 30-35 psi switch on, no start. Pressure would fall immediately.
30 or so psi running. Gauge needle bouncing around. .KEMSO argued about replacement, LIFETIME WARRANTY.
I sent a copy of his AD and asked him, what part of LIFETIME warranty was he having a problem with. He finally agreed to send replacement. It was in shop so I had them (ebay 90 Corvette fuel pump) Shop Replaced with Delphi FE0110, at my request, (No CARQUEST crap) runs great.( so far)
Tested KEMSO with direct connection. in-hand. NOISY, VIBRATES badly. Immediately loses prime on shut-down.
IMHO, do not waste your time with cheapo after market. I have 3, C4's. 90 vert, 96 CE vert, 96 GS coupe. Normal maintenance.
Roger
2017 replaced sender( it would LIE) so put new fuel pump in,as precaution, also. Ordered KEMSO Fuel Systems,10912, Hi-Perf!. Pump said 340 LPH @ 43 psi ($29.95 total)(they compared with WALBRO 255). Says made in Japan, name registered to Chinese man., !?unk?! No markings on pump of country
They say direct OEM direct fit. NOT! splice wires and refit in sender
Did not check fuel pressure on install. It ran, I was happy! Developed running issues, rough idle low RPM surge.( NEW PUMP.! what could it be?) New fuel filter, new gas. vacuum tests, so on. (siphoned tank, CLEAN & CLEAR) FPR vacuum on or off, no change. (Total tune-up, wires , plugs, dist internals, etc, )
Fast Forward 2018 running issues worsened. Put pressure gauge. Tested repeatedly. Sitting and driving. 30-35 psi switch on, no start. Pressure would fall immediately.
30 or so psi running. Gauge needle bouncing around. .KEMSO argued about replacement, LIFETIME WARRANTY.
I sent a copy of his AD and asked him, what part of LIFETIME warranty was he having a problem with. He finally agreed to send replacement. It was in shop so I had them (ebay 90 Corvette fuel pump) Shop Replaced with Delphi FE0110, at my request, (No CARQUEST crap) runs great.( so far)
Tested KEMSO with direct connection. in-hand. NOISY, VIBRATES badly. Immediately loses prime on shut-down.
IMHO, do not waste your time with cheapo after market. I have 3, C4's. 90 vert, 96 CE vert, 96 GS coupe. Normal maintenance.
Roger
Team Owner
Joined: Jul 2004
Posts: 28,416
Likes: 3,270
From: Hartford WI
1990 Corvette L98 just turned 55,000 in 2018
2017 replaced sender( it would LIE) so put new fuel pump in,as precaution, also. Ordered KEMSO Fuel Systems,10912, Hi-Perf!. Pump said 340 LPH @ 43 psi ($29.95 total)(they compared with WALBRO 255). Says made in Japan, name registered to Chinese man., !?unk?! No markings on pump of country
They say direct OEM direct fit. NOT! splice wires and refit in sender
Did not check fuel pressure on install. It ran, I was happy! Developed running issues, rough idle low RPM surge.( NEW PUMP.! what could it be?) New fuel filter, new gas. vacuum tests, so on. (siphoned tank, CLEAN & CLEAR) FPR vacuum on or off, no change. (Total tune-up, wires , plugs, dist internals, etc, )
Fast Forward 2018 running issues worsened. Put pressure gauge. Tested repeatedly. Sitting and driving. 30-35 psi switch on, no start. Pressure would fall immediately.
30 or so psi running. Gauge needle bouncing around. .KEMSO argued about replacement, LIFETIME WARRANTY.
I sent a copy of his AD and asked him, what part of LIFETIME warranty was he having a problem with. He finally agreed to send replacement. It was in shop so I had them (ebay 90 Corvette fuel pump) Shop Replaced with Delphi FE0110, at my request, (No CARQUEST crap) runs great.( so far)
Tested KEMSO with direct connection. in-hand. NOISY, VIBRATES badly. Immediately loses prime on shut-down.
IMHO, do not waste your time with cheapo after market. I have 3, C4's. 90 vert, 96 CE vert, 96 GS coupe. Normal maintenance.
Roger
2017 replaced sender( it would LIE) so put new fuel pump in,as precaution, also. Ordered KEMSO Fuel Systems,10912, Hi-Perf!. Pump said 340 LPH @ 43 psi ($29.95 total)(they compared with WALBRO 255). Says made in Japan, name registered to Chinese man., !?unk?! No markings on pump of country
They say direct OEM direct fit. NOT! splice wires and refit in sender
Did not check fuel pressure on install. It ran, I was happy! Developed running issues, rough idle low RPM surge.( NEW PUMP.! what could it be?) New fuel filter, new gas. vacuum tests, so on. (siphoned tank, CLEAN & CLEAR) FPR vacuum on or off, no change. (Total tune-up, wires , plugs, dist internals, etc, )
Fast Forward 2018 running issues worsened. Put pressure gauge. Tested repeatedly. Sitting and driving. 30-35 psi switch on, no start. Pressure would fall immediately.
30 or so psi running. Gauge needle bouncing around. .KEMSO argued about replacement, LIFETIME WARRANTY.
I sent a copy of his AD and asked him, what part of LIFETIME warranty was he having a problem with. He finally agreed to send replacement. It was in shop so I had them (ebay 90 Corvette fuel pump) Shop Replaced with Delphi FE0110, at my request, (No CARQUEST crap) runs great.( so far)
Tested KEMSO with direct connection. in-hand. NOISY, VIBRATES badly. Immediately loses prime on shut-down.
IMHO, do not waste your time with cheapo after market. I have 3, C4's. 90 vert, 96 CE vert, 96 GS coupe. Normal maintenance.
Roger
