| Author | Message | ||
| "The Don" (The_don)
Senior Member Username: The_don Post Number: 5801 Registered: 8-2002 |
Paul, if you have the old (original) corona fuel pump. Clamp the fuel lines and remove the three screws on the bottom. A disk with 5 black spacers will come out. Reseat them and reattach it. That might fix it. | ||
| Paul (Pcelenta)
Member Username: Pcelenta Post Number: 371 Registered: 7-2002 |
mark, what did you use to reglue it? | ||
| Mark Foley (Sparky)
Junior Member Username: Sparky Post Number: 65 Registered: 3-2002 |
Paul: Yes I cleaned it and put I back in. When it first came out (as in the picture) it did not look plugged, but when the dab of glue (looked like JB Weld) was removed and the element was held-up to the sun you could tell it was restricted. Mark | ||
| Paul (Pcelenta)
Member Username: Pcelenta Post Number: 370 Registered: 7-2002 |
thanks Mark...I am going to check the strainer too...In the last tank of gas I put a container of techron in and I'm thinking that it may have loosened up some stuff in the tank and or gave the dying fuel pump its last kiss of death..Did you just clean it and put it back in? The fuel filter was recently changed. | ||
| Mark Foley (Sparky)
Junior Member Username: Sparky Post Number: 63 Registered: 3-2002 |
Paul: I had a "whinning" fuel pump on my 328 and I had recently replaced the fuel filter. The problem was caused by a clogged fuel inlet strainer which is located in the tank. The clog caused a fuel starvation condition. This may be the cause of your problem. See picture--a 15/16" deepwell socket or end wrench is required. Mark  | ||
| Paul (Pcelenta)
Member Username: Pcelenta Post Number: 369 Registered: 7-2002 |
did some electrical tests... at the coils (connect tester to + and - on coils) 7.25 volts on both coils...it actual drops when the engine is revvd to about 5.25 volts at each coil...I think this might be a problem. The battery registers a consistant 13.25 volts...it is a 6 month old optima. | ||
| Paul (Pcelenta)
Member Username: Pcelenta Post Number: 368 Registered: 7-2002 |
Steve, "poor (but consistent) running over the full RPM range without irregular stumbling/coughing (if I understand your description -- please correct if I've got it wrong)." This is correct...it is very strange in that there is no stumbling or coughing...just no power through the band...and a real flat sound. When I pulled the coil wires RPM dropped in both cases for front and rear bank...and in both cases the engine continued to run. I haven't hooked up the timing light yet..will do it today...also want to check the volts at the battery and at the coils...something has got me thinking bad voltage regulator/alternator, resulting in not enough power to the XR700's and weak spark.. yes, the fuel pump has been sending signals...going to get replaced during this repair/trouble shooting. | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1944 Registered: 1-2001 |
Paul -- On a carburetted engine I'm thinking it's not easy to get the symptom you report from the fuel supply side -- poor (but consistent) running over the full RPM range without irregular stumbling/coughing (if I understand your description -- please correct if I've got it wrong). If the fuel supply side is impaired (either by bad pump or blocked filter) the result would more likely be "running out of gas at sustained higher RPM (but idling and running at low RPM OKish)" as the (unpressurized) fuel bowls drained -- i.e., if the fuel supply side can't keep up with the engine ingestion rate. Have you put a timing light on #1 and #5 just to get a feel for the ignition side health (e.g., timing not irregular, the advance behaviors are relatively OKish, etc.)? Can you elaborate on: "pulled the coil wires to test and there was no difference in engine speed" (both what you did and the result)? But a fuel pump that whines anytime is not a good thing -- you need to sort out if it's just an acoustic/vibration/mounting problem or an actual fuel pump problem regardless of your other problem IMO -- it's given you fair warning  . | ||
| Dave (Dave)
Member Username: Dave Post Number: 527 Registered: 4-2001 |
You might replace the fuel filter if it hasn't been replaced it the last 20 plus years. | ||
| Paul (Pcelenta)
Member Username: Pcelenta Post Number: 367 Registered: 7-2002 |
went to take the 308 (78) today for a 4th of july run...fired right up...but just didn't sound right...wife and I go down the block...and the car will rev but has no power and sounds flat (no stumbles)...turn right around and go home...Just had it out the other day and ..I ran some techron in it to clean things out and it was running just fine. Pulled the plugs and they weren't fouled...just grey...pulled the coil wires to test and there was no difference in engine speed...pulled the distrib caps off and they looked fine...now I am thinking fuel..or possibly XR700 failure..how can I go about testing the fuel pump? It does wine on occasion which had occured only in the winter months but now seems to happen in the summer. Anything else I should be checking? |